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跑到4,000米时，他开始体力不支。用英语怎么说？

跑到4,000米时，他开始体力不支。

By 4,000m he was beginning to flag.

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；
例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

he

pron. 他，它，一个人；n. 雄性动物；
例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

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；
例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

beginning

n. 开始，根源，原始思想，前兆；v. 开始( begin的现在分词)；
例句
Alarm bells are beginning to sound at Westminster.
威斯敏斯特的警钟已开始敲响。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；
例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

flag

n. 旗，旗帜，信号旗，菖蒲；vt. 标示；vi. 疲乏，变弱，热情衰减；
例句
...Britain's flag bearer at the Olympic Games opening ceremony...
奥运会开幕式上的英国旗手
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
Supporters of the death penalty argue that it would deter criminals from carrying guns...
死刑的支持者认为它能阻吓罪犯携带枪支。
相关例句
...concern over recent events in Burma...
对缅甸近期所发生事件的关注
There was dead silence but for a fly beating against the glass...
当时一片寂静，只听见一只苍蝇不停地撞击着玻璃。
I tried to slip up the stairs unnoticed...
我试图趁没人注意溜上楼去。
The company recently slimmed its product line.
公司最近压缩了产品线。
Several of the lights went out, one after another.
其中几盏灯一个接一个地熄灭了。
...the rolling countryside of south western France.
法国西南部绵延起伏的乡村
Happily, Lisa Martineau takes an opposite approach.
幸运的是，莉萨·马蒂诺采取了截然相反的方式。
...a plain-spoken American full of scorn for pomp and pretense.
看不惯炫耀和虚伪、直言不讳的一个美国人
...kangaroo hide.
袋鼠皮
She had become addicted to golf.
她已经迷上高尔夫球了。