Instructor: Because it makes your serve more powerful and threatening.
教练：这可以使你的发球更有力度，更有威胁。
Companies have been more aggressive and threatening to move production to Mexico.
公司越来越积极地和具有威胁性地把生产转移到墨西哥去。
Companies have been more aggressive and threatening to move production to Mexico.
公司越来越积极地和具有威胁性地把生产转移到墨西哥去。
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