用户:TongcyDai/沙盒/2

• 一些语言中有多于一种的升调或降调。

A work-around for diacritics sometimes seen when a language has more than one rising or falling tone, and the author wishes to avoid the poorly legible diacritics ɔ᷄, ɔ᷅, ɔ᷇, ɔ᷆ but does not wish to completely abandon the IPA, is to restrict generic rising ɔ̌ and falling ɔ̂ to the higher-pitched of the rising and falling tones, say ɔ˥˧ and ɔ˧˥, and to use the old (retired) IPA subscript diacritics ɔ̗ and ɔ̖ for the lower-pitched rising and falling tones, say ɔ˩˧ and ɔ˧˩. When a language has four or six level tones, the two mid tones are sometimes transcribed as high-mid ɔ̍ (non-standard) and low-mid ɔ̄.

Tone letters generally appear after each syllable, for a language with syllable tone (⟨a˧vɔ˥˩⟩), or after the phonological word, for a language with word tone (⟨avɔ˧˥˩⟩). However, in older versions of the IPA, ad hoc tone marks were placed before the syllable, the same position as used to mark stress, and this convention is still sometimes seen (⟨˧a˥˩vɔ⟩, ⟨˧˥˩avɔ⟩).

There are three boundary markers, ⟨.⟩ for a syllable break, ⟨|⟩ for a minor prosodic break and ⟨‖⟩ for a major prosodic break. The tags 'minor' and 'major' are intentionally ambiguous. Depending on need, 'minor' may vary from a foot break to a continuing–prosodic-unit boundary (equivalent to a comma), and while 'major' is often any intonation break, it may be restricted to a final–prosodic-unit boundary (equivalent to a period). Although not part of the IPA, the following boundary symbols are often used in conjunction with the IPA: ⟨μ⟩ for a mora or mora boundary, ⟨σ⟩ for a syllable or syllable boundary, ⟨#⟩ for a word boundary, ⟨$⟩ for a phrase or intermediate boundary and ⟨%⟩ for a prosodic boundary. For example, C# is a word-final consonant, %V a post-pausa vowel, and T% an IU-final tone (edge tone).

(comparative degree) This is a productive process, but apart from extra-high and extra-low tones ⟨ə̋, ə̏⟩ being marked by doubled high- and low-tone diacritics, and the major prosodic break ⟨‖⟩ being marked as a double minor break ⟨|⟩, it is not specifically regulated by the IPA. (Note that transcription marks are similar: double slashes indicate extra (morpho)-phonemic, double square brackets especially precise, and double parentheses especially unintelligible.)

(Normally additional degrees of length are handled by the extra-short or half-long diacritics, but in the Estonian examples, the first two cases are analyzed as simply short and long.)

• The transcription of strident and harsh voice as extra-creaky /a᷽/ may be motivated by the similarities of these phonations.

(符号) and laterals are separated out so that the rows reflect the common lenition pathway of stop → fricative → approximant, as well as the fact that several letters pull double duty as both fricative and approximant; affricates may be created by joining stops and fricatives from adjacent cells. Shaded cells represent articulations that are judged to be impossible.

(非肺部气流音)

In these approaches, the click letter represents both articulations, with the different letters representing different click 'types', there is no velar-uvular distinction, and the accompanying letter represents the manner, phonation, or airstream contour of the click: ⟨ǂ, ᶢǂ, ᵑǂ⟩ etc.

The ejective diacritic often stands in for a superscript glottal stop in glottalized but pulmonic sonorants, such as [mˀ], [lˀ], [wˀ], [aˀ]. These may also be transcribed as creaky [m̰], [l̰], [w̰], [a̰].

(没有字母的音段) Similarly, a labiodental trill would be written [ʙ̪] (bilabial trill and the dental sign), and labiodental stops [p̪ b̪] rather than with the ad hoc letters sometimes found in the literature. Other taps can be written as extra-short plosives or laterals, e.g. [ɟ̆ ɢ̆ ʟ̆], though in some cases the diacritic would need to be written below the letter. A retroflex trill can be written as a retracted [r̠], just as non-subapical retroflex fricatives sometimes are. The remaining consonants, the uvular laterals (ʟ̠ etc.) and the palatal trill, while not strictly impossible, are very difficult to pronounce and are unlikely to occur even as allophones in the world's languages.

(though for those who conceive of vowel space as a triangle, simple [ɶ] already is the rounded equivalent of [æ]).

True mid vowels are lowered [e̞ ø̞ ɘ̞ ɵ̞ ɤ̞ o̞] or raised [ɛ̝ œ̝ ɜ̝ ɞ̝ ʌ̝ ɔ̝], while centered [ɪ̈ ʊ̈] and [ä] (or, less commonly, [ɑ̈]) are near-close and open central vowels, respectively. The only known vowels that cannot be represented in this scheme are vowels with unexpected roundedness, which would require a dedicated diacritic, such as protruded ⟨ʏʷ⟩ and compressed ⟨uᵝ⟩ (or ⟨ɪʷ⟩ and ⟨ɯᵝ⟩).