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By 4,000m he was beginning to flag.是什么意思？

By 4,000m he was beginning to flag.

跑到4,000米时，他开始体力不支。

相关词汇
by he was beginning to flag

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

he

pron. 他，它，一个人；n. 雄性动物；

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

beginning

n. 开始，根源，原始思想，前兆；v. 开始( begin的现在分词)；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

flag

n. 旗，旗帜，信号旗，菖蒲；vt. 标示；vi. 疲乏，变弱，热情衰减；
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