我没时间来准备这次会议，我只能临场发挥了。
I don't know what to say when he comes, just play it by ear.
玛丽：这样的问题事先通常无法准备，只能临场发挥。
Mary: Usually, you cannot prepare for these questions in advance and have to depend on your immediate performance.
这就对日程行为，判断和一般性的临场发挥也会产生不利的影响。
This has an adverse effect on the behavior, judgment and general performance.
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