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这是一个无根据的假设。用英语怎么说？

这是一个无根据的假设。

This is an invalid assumption.

相关词汇
this is an invalid assumption

this

pron. 这，这个，这事，这人，这时，下面所说的事；adj. 这，这个，刚过去的，即将到来的，今…，本…；adv. 这样地，就是这样，这么地；
例句
Victoria Falls has had above average levels of rainfall this year...
维多利亚瀑布今年的降雨量超过了平均水平。

is

vt.& vi. 是（be的三单形式；n. 存在；
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；
例句
He started eating an apple...
他开始吃苹果。

invalid

adj. 无效的，不能成立的，有病的，病人用的；vt. 使伤残，使退役，失去健康；n. 病人，病号，残废者，伤病军人；vi. 变得病弱，因病而奉命退役；
例句
We cannot accept liability if you are refused entry because of invalid documents.
如果你因证件无效被拒入内,我们不承担责任。

assumption

n. 假定，假设，承担，想当然，采取；
例句
...their assumption that all men and women think alike.
他们关于所有男人和女人思考问题的方式都类似的假定
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。
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。
相关例句
His head moved in an almost imperceptible nod.
他点头的动作微小得几乎看不出来。
He gave in to curiosity and opened my letter.
他抑制不住好奇心, 拆开了我的信。
It was ludicrous to think that the plan could succeed.
认为此计划会取得成功是荒唐的。
an indigent wine-drinking alcoholic
穷困的酒鬼
a movie entitled ‘Short Legs’
一部名为《短腿》的电影
They sell inferior goods at that store.
那家商店卖劣等货。
Her cheeks began to fill out after she’d been in the convalescent hospital for a couple of months.
在疗养院养了两个月以后,她的脸渐渐变圆了。
The child is rather spoiled because his mother has always let him have his own way.
这孩子给娇惯坏了,他妈妈总是由着他爱干什么就干什么。
In the country, traffic keeps to the right.
在该国, 车辆靠右行驶。
We just can’t afford to buy a house at the moment. It’s a seller’s market, and there’s nothing we can do about it.
我们眼下还买不起房。现在是卖方市场，我们也没有办法。