Which of these do you think is the second most useful invention?
你认为哪一个是第二有用的发明？
Which of these do you think is the second most useful invention?
你认为哪一个是第二有用的发明？ ？
Which of these do you think is the second most useful invention?
你认为这些当中哪一项是第二个最有用的发明？
The drilling machine is the second oldest machine tool, having been invented shortly after the lathe, and is one of the most comom and useful machines.
钻床是第二代机床，被发明在车床之后，并且是多数常见和有用的机器之一。
The drilling machine is the second oldest machine tool, having been invented shortly after the lathe, and is one of the most comom and useful machines.
钻床是第二代机床，被发明在车床之后，并且是多数常见和有用的机器之一。
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