说大声点，那样我们就能听见你了。
大声点。，lewin：，So, speak, up。，我们可以尝试用，机械能守恒定律吗？，这样用有什么问题吗？
LEWIN Shall we try the conservation of mechanical energy Is there anything wrong with that?
比我们小的孩子必须和他们的母亲一块出去，我们大一点的就一起哄到领居家，按他们的门铃并大声喊道：“恶作剧还是招待！”
The little kids (children younger than we were) had to go with their mothers, but we older ones went together to neighbors' houses, ringing their doorbell and yelling, "Trick or treat!"
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