专心致志：全力以赴，集中精力。
... make an appeal to sb向或者人提出呼吁；上诉 apply one's mind to专心于… apply to向…申请或者要求 ...
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... turn to 酿成;乞助于;入手 apply one's mind to 用心于… clear out 把…清出(或者出空) ...
专心于
keep one's mind on / devote one's attention to / give one's mind to