sluggish flow 缓慢流动 ; 缓流 ; 滞流 ; 微动流
sluggish flow time 滞流时间
sluggish flow ratio 缓流率
The westward flow of population would have been far more sluggish.
否则人口的向西迁移也将缓慢得多。
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模块上移
模块下移
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