它庞大，易开采，而且相对便宜。
幸运的是，我们生活在一个图书多多而且相对便宜的时代。
Luckily for us, we live in an age where books are plentiful and relatively inexpensive.
首先，电视不仅是一种方便的娱乐来源，而且相对较便宜。
In the first place, television is not only a convenient source of entertainment, but also a comparatively cheap one.
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