请认真对待这件事。
其中暗示着，如果你回顾其它许多事，那么你没有认真对待这件事。
The implication is that if you take a lot of other things in review, you're not taking this one thing seriously.
所以要更认真对待这件事，这样双方都不会觉得自己占了对方便宜。
Make it more businesslike, so neither of you feels like you're taking advantage of the other.
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