英语翻译Medical research are painfully aware that there are many

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/09 09:42:42

英语翻译
Medical research are painfully aware that there are many problems （to which they have no answers yet till now）他们至今还没有答案这里的to为什么要至前啊?还有那个till换成untill可以吗?answer一般都要加s吗?
Medical researchers are painfully aware that there are many problems （to which they have no answers yet till now） researchers掉了ers了

to前置是定语从句中介词前置的一种用法.which指代先行词problems,整句话是no answers to many problems.所以是用to而不是其他介词.
till 和 untill 的界定在英语中也不是很严格,你要换也没人深究的吧.
answer是可数名词,加不加-s,依语境和句意而定,这里是many problems ,所以answers就不只一个咯.

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