;
便车;In dealing with that unpredictable man, you simply cannot follow a prearranged plan, you have to play it by ear.
和那个捉摸不定的人打交道, 
简直无法按预定计划行事, 只好随机应变。
, 预先商定In dealing with that unpredictable man, you simply cannot follow a prearranged plan, you have to play it by ear.
和那个捉摸不定的人打交道, 简直无法按预定计划行事, 只好随机应变。
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