只有经过认真研究才能回答这些问题。
不经过认真研究而要发现事实真相是非常困难的。
It's very difficult to find out the truth without studying carefully.
他说，他希望参议员们在经过认真研究之后再作决定，他要求参议员将他的建议作为一个系统，而不是单独的法案来看。
He said he hoped they would decide on them only after careful study. He asked them to see the proposals as a system of compromise, not as separate bills.
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