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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；
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
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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。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
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。
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...simple math concepts, such as decimals and fractions.
简单的数学概念，如小数和分数
...a smart residential district.
豪华的住宅区
They beat the Giants by a score of 7 to 3...
他们以 7 比 3 的比分击败了巨人队。
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借款的实际成本
You don't know the first thing about farming.
你对种地一窍不通。
He was disheartened by their hostile reaction.
他们的敌对反应让他打了退堂鼓。
'I'll go up in one second, I promise.' — 'Never mind,' I said with a sigh. 'I'll do it.'...
“我保证马上就上来。”——“没关系，”我叹了口气说，“我自己来。”
Discrimination by employers on the grounds of race and nationality was illegal.
雇主以种族或国籍为由歧视员工是非法的。
The dam will stand 600 feet high...
大坝将高达 600 英尺。
The compressed gas is cooled and condenses into a liquid...
压缩气体经冷却凝结成液态。