by half意思是“一半”,而且一般指“減少一半”,本句話的意思就是“把那些吸煙（有害健康）的場景擺出來能讓青少年吸煙人數(shù)減少一半”.
沒有to half用法
reduce (by) half.
reduce (by) half.
Taking out these smoking scenes could reduce the number of teen smokers (by) half.
為什么不能用to
Taking out these smoking scenes could reduce the number of teen smokers (by) half.
為什么不能用to
英語人氣：957 ℃時(shí)間：2020-06-13 01:30:18
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