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对某事物掌握得很紧用英语怎么说？

对某事物掌握得很紧

a tenacious hold on something

相关词汇
tenacious hold on something

tenacious

adj. 顽强的，黏着力强的，坚决的，（记忆力）持久的；
例句
She is very tenacious and will work hard and long to achieve objectives...
她是个锲而不舍的人，为了达到目标愿意长期苦干。

hold

vt. 拿住，握住，保留，保存，扣留，拘押，容纳，举
例句
I will hold myself aloof from wrong and corruption.
我会让自己远离错误和腐败。

on

prep. （表示方向）向，（表示对象）对，（表示位置）在…上，（表示时间）在…之时；adv. （放，穿，连接）上，向前，（继续）下去；adj. 活动着的情况，状态，使用着的，发生着的，计划中的；
例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

something

pron. 某物，某事，重要的事物[人]，有一定意义的事物；n. （表示不确切的描述或数量）大致，左右；adv. 非常，有点，大约；
例句
Rachel was going to do something about Jacob...
蕾切尔将对雅各布有所行动。
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。
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。
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。
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。
相关例句
compression atrophy
压迫性萎缩
The sheep got into the field through a gap in the hedge.
羊群从树篱的缺口跑向田野。
He often makes a round trip to the hospital alone.
他经常一个人往返医院。
She smiled ironically.
她嘲讽地一笑。
They're trying to enact a “nationality” bill.
他们正试图通过一项“国籍”法案。
an energy sensitive microfilm
能量敏感的缩微胶片
The quarrel resulted in his mother leaving the house.
争吵导致了他母亲离家出走。
The boy made the baby laugh by making a face at him.
那男孩扮鬼脸逗那个婴儿笑。
deep political machinations
老谋深算的政治诡计
For a moment I thought I was having hallucinations.
一时间我以为我产生了幻觉。