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contractions
Contraction is the process of becoming smaller or shorter.
expansion
the contraction and expansion of blood vessels.
血管的收缩与扩张。
Foods and fluids are mixed in the stomach by its muscular contractions.
通过胃部肌肉的收缩，食物和液体在胃中混合。
When a woman who is about to give birth has contractions, she experiences a very strong, painful tightening of the muscles of her womb.
The contractions were getting stronger.
宫缩越来越强烈。
A contraction is a shortened form of a word or words.
'It's' (with an apostrophe) can be used as a contraction for 'it is'.
“It's”（带撇号）是“it is”的缩写形式。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。