He couldn't come up with an appropriate answer just at the time.
那时他想不出一个合适的答案。(现在这问题对于他来说只是小菜一碟了。)
It (the problem) must be dealt with by appropriate means at an appropriate time.
这个问题必须在适当的时候以适当的方式予以处理。
It must be dealt with by appropriate means at an appropriate time.
这个问题必须在适当的时候以适当的方式予以处理。
It must be dealt with by appropriate means at an appropriate time.
这个问题必须在适当的时候以适当的方式予以处理。
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