constraint

Their decision to abandon the trip was made because of financial constraints.

他们放弃这次旅行的决定是因财务限制而作出的。

The terrible constraint on organ transplantation is that every life extended depends on the death of someone young enough and healthy enough to have organs worth transplanting.

器官移植的可怕限制是，每延长一个人的生命都取决于一个有可移植器官的人的死亡，这个人足够年轻且足够健康。

Compared with a hundred years ago, our lives are less tightly bound by social norms and physical constraints.

与一百年前相比，我们的生活不再那么受社会规范和身体限制的束缚。

At last we could relax and talk without constraint.

我们终于可以放松下来，无所拘束地谈话了。