the vowel __________ can be described as low, front, and unrounded, but the feature “unrounded” is usually omitted because all front vowels in english are unrounded.
the positional variants of the same phoneme are known as __________.
美育和______的关系最为密切。( )
已知某连续时间系统的单位冲激响应，系统的频率响应( )
syllables are units of language, aller than a word but larger than a phoneme, and every language is said to have syllables.
a public speaker tends to pause less frequently to make their message clearer or more emphatic. by contrast, if the speaker is communicating urgency, he may contain more breaks.
描述某因果的连续时间lti系统的微分方程为 则该系统的系统函数和单位冲激响应分别为( )
within the class of approximants, lateral /l/ and retroflex /r/ are further distinguished from semi-vowels /j/ and /w/. this is because /j/ and /w/ are made without a restriction to the airflow. they are phonetically like consonants but phonologically like vowels.
vowels which trigger [r]-insertion never trigger [j]-insertion or [w]-insertion. each glide has its own domain, although the domains exempt short stressed vowels /e, æ, ɒ, ʊ, ʌ/, which never occur word-finally in english.