N a gradual alteration or series of alterations in the pronunciation of a set of sounds, esp of vowels 语音(特指原音的)演变 → see also Great Vowel Shift
Grimm's major contribution to historical linguistics is his explanation of the relationships among cognates in terms of a sound shift, the systematic modification of a series of phonemes.
格里姆对历史语言学的主要贡献是，他从音变-一系列音位有系统的变异-的角度解释了同源词之间的关系。
It is similar to how the sound of a train's whistle seems to shift as it recedes into the distance.
这个现象与当火车向远处后退时的汽笛响声类似。
It may sound silly, but even the tiniest shift of a kitchen table or couch can make all the difference.
听起来可能很傻，但是即使最小的移动厨房的桌子或者椅子都可以有很大的改变。
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