... 一般摄动理论 general theory of perturbation 一次差 first difference 一等三角测量 primary triangulation ...
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他刚一到家,就又要他出另一次差。
He had no sooner (no sooner had he) arrived home than he was asked to start on another journey.
她的家庭作业一次比一次差。
替换一次差的雇佣,成本远远超过一次性就雇佣优秀人才所多出的边缘成本。
The cost of replacing a bad hire far exceeds the marginal additional cost of hiring the best person in the first place.
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