| 短语 | tread on delicate ground |
| 释义 | tread on delicate ground接触微妙问题;碰到棘手问题：After we took over this task，we began to perceive that we had trodden on delicate ground.在我们把这项任务接过来以后，我们才开始觉察到我们碰到的是个棘手问题。 |
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