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But mainstream science has practically given up但实际上，主流科学界已放弃
give up:放弃
She doesn't give up easily.
她做任何事都不轻易放弃。
常用短语:
give up for lost认定(某人)己无生还的希望,认为某事己没有希望
Just as it had been given up for lost,the book was found.
正当大家认为书已丢失时，这本书却被找到了。
give oneself up to向 ... 自首
He decided to give himself up to the police.
他决定向警方自首。
because you might think it's gonna fall down,因为你认为建筑物会倒塌
fall down:跌倒；倒塌
The worker fell down from the scaffold.
那个工人从脚手架掉了下来。
You must watch your step so as not to fall down.
你必须留心脚下才不会跌下去。
