Women are too often constrained by family commitments and by low expectations. [be VERB-ed]

女性往往受到家庭责任和低期望值的束缚。

How can we produce top-class engineers when universities are constrained to offer salaries that can only attract mediocre staff?. [be VERB-ed to-infinitive]

大学的财力有限，提供的薪酬仅能吸引水平一般的教师，在这种情况下，我们如何能培养出一流的工程师？

It's the capacity of those roads which is going to constrain the amount of travel by car that can take place. [VERB noun]

制约驾车出行量的将会是那些道路的通行能力。

For some reason he felt constrained to lower his voice.

不知怎么的，他觉得自己必须得压低声音。