Pollution is a common example of an externality that leads to market failure. 污染是外部性導致市場(chǎng)失效的一個(gè)常見(jiàn)的例子。
The most common example of a machine element is a gear, which, fundamentally, is a combination of the wheel and the lever to form a toothed wheel. 機械元件最常見(jiàn)的例子是齒輪，從根本上說(shuō)，齒輪是輪子和杠桿的一種集合形成一個(gè)齒形的輪子。
Compu-ers are a familiar example. 電腦是一個(gè)大家熟悉的例子。
