重點講解：
1. vow to do sth. 發誓；起誓；立誓；
He vowed to take legal action.
他誓言要采取法律行動EA2R#@oH.Uq7HFWI4=QQ。
2. part of 一些；部分；
The change is part of the government's policy of phasing in Arabic as the official academic language.
這一變革是政府將逐步采用阿拉伯語作為官方學術語言政策的一部分JT9s_KBFLv13xS^f;tf。
3. at least （數量）至少，不少于；
He has killed many in his time, and is wanted in at least three countries.
他那個時候殺了很多人，現在至少有3個國家在通緝他Tlff,Yi+u)~-I(mAy。
4. at large 在逃的；未被捕獲的；
He remains at large despite the high price put on his head by the authorities.
盡管當局懸賞重金緝拿他，他仍舊逍遙法外|10;4HQ(XNi_l]eB7c。