module 5 explanations for new words and phrases
1. expand vi. become or make larger or more extensive 扩大/扩充/扩展/膨胀；伸展/开,张/展开
e.g. expand his chest 扩胸 expand trade/export 扩大贸易/出口
their business expanded into other hotels and properties. 业务扩展到了其他旅馆和房地产。
the ranks of the teachers are constantly expanding. 教师队伍日益扩大了。
he does exercises to expand his chest. 他做体操扩胸
metals expand by heat. 金属受热而膨胀。 expand with heat 热胀
many flowers expand in the sunshine. 花儿在阳光下绽放。
2. contract vi. decrease in size, number, or range 收缩/缩小/缩短/缩紧；和……订合同;
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