1. To apply oneself earnestly to a task. 
   认真地投入工作
2. develop a habit; apply oneself to a practice or occupation. 
   养成一种习惯；致力于一种实践或职业。
3. Push oneself forwardbambitiously draw attention to oneself 
   引人注意自己；出风头
4. address or apply oneself to something, direct one's efforts towards something, such as a question. 
   致力于……把某人的努力投向于某一方面。
5. Plight oneself to sb. 
   和某人订婚

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