她是如此烦恼，因此她无法成眠。
他昨夜无法成眠，因为他整夜都在咳嗽。
He didn't sleep a wink last night because he kept coughing all night long.
他试图用意志力控制住疼痛，也确实相当有效，但再也无法成眠。
He tried to keep the pain under control by force of will and was, in fact, fairly successful, but he could not fall asleep again.
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