你走进实验室说，“我是研究生，然后傻笑”。
You come into the lab and say, "Okay. I'm the graduate student. Ha, ha, ha."
不然，我昨天晚上就会看见史密斯先生走进实验室。
Otherwise, I would have seen Mr. Smith enter the laboratory yesterday evening.
不然，我昨天晚上就会看见史密斯先生走进实验室。
Otherwise, I would have seen Mr. Smith enter the laboratory yesterday evening.
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