By the time 250,000 were on the bridge, engineers noticed something terrible: the roadway was flattening under what turned out to be the heaviest load it had ever been asked to carry.

当25万人在桥上时，工程师们注意到一件可怕的事情：路面被有史以来最沉重的负荷压扁了。

Carry a light paperback around with you. When you find yourself waiting for something, on the train or bus, or just bored, you can get the book out.

随身带些小册书籍，当你感觉自己陷入漫长的等待之中，比如说在搭乘火车或汽车，或者感到无聊，你就可以拿起书本。

For example, suppose you want the actor to carry out a couple of different actions in response to messages sent; the new implementation would look something similar to Listing 2.

例如，假设希望actor用两个不同的动作来响应发送的消息；新的实现可能与清单2相似。

May I take something out of it? There's an overcoat I can carry by hand.

我可以拿出点东西吗？有件外套我可以用手拿着。

We don't carry out our moral commitment by taking up a public stance on these things, but only by choosing to do something about them ourselves.

我们承担道德责任的方式不是采取公共的立场，而是我们自己选择去做些什么。