perforce

adv.

必然，必要地，不得已；

1. They had perforce to abandon the attempt on the summit.
   他们必然要放弃峰会上的企图。
2. When a horse is shot, the man on the horseback perforce falls down.
   马被击中时，马背上的人必然会跌落下来。
3. He stood up, and they perforce stood up with him.
   他站起身来, 他们只好同他一起站起身来。

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