这封道歉信是迫于压力写的，并非出自真心。

The apology letter was ___forced, not written from the heart.

他在会议上挤出一个勉强的笑容，显然对这个提议很不满意。

He gave a ___forced smile during the meeting, clearly unhappy with the proposal.

经过一整天的工作，他的微笑看起来很勉强。

After a long day at work, his smile seemed ___forced.