你觉得满脸通红，膝盖变得虚弱无力。
You literally feel flushed and your knees go weak.
youdao
简在手术之后，仍然觉得有些虚弱无力。
Jean's still feeling a little low after her operation.
他跑到溪水边去喝水，觉得自己心里虚弱无力。
He went to the streamlet to drink, feeling faint and weak of spirit.
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