| 单词 | expansion and contraction |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔pulsate〕These verbs mean to exhibit recurrent rhythmical movements of or like those involved in the periodic expansion and contraction of the heart.这些动词的意思是表现类似心脏周期性扩张和收缩的重复有节奏的运动。美国传统 |
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