英語翻譯：

arrogate to oneself; be good at

例句：

1. 他因擅離職守而被降級（為下士）。
   He was busted (to corporal) for being absent without leave.
2. 無通行證者不得擅入軍事基地。
   You cannot enter a military base without a permit.
3. 她未請示上級擅自把所有這些請柬都發(fā)了出去。
   She issued all these invitations without any reference to her superiors.
4. 他們未經(jīng)許可擅入該地。
   They entered the area without permission.