It was youthful error, and only the force of circumstance prolonged it.

这是年轻时犯的错误， 只是环境的力量使它延长了。

The United States was compelled by force of circumstances to adopt a Russian policy.

美国迫于形势的力量采取了俄罗斯的政策。

No solemn promises bound us to him. In order to keep us captive, he had counted only on the force of circumstances and not on our word of honor.

没有什么誓言把我们跟他束缚在一起。他相信把我们永远拉在他身边的，只是客观环境的力量，而不是我们的约言。

They found the fertile lands of the coast and river valleys nearly all monopolized by planters, and they were by the force of circumstances driven into the uplands where the soil was thin and the crops were light.

他们发现沿海和河谷的肥沃土地几乎都被种植园主垄断了，他们迫于形势的驱使， 进入了土壤稀薄、庄稼稀少的高地。