Materials can already be made to do some of these things, but they are too bulky, rigid or complicated for practical use.
虽然一些材料已经可以实现这些想法，但是这些材料要么体积庞大、面料僵硬，要么在实际运用中过于麻烦。
They last longer than plastic, they don’t stain, and since you are reusing something you already have, they are practical too.
玻璃瓶比塑料瓶寿命长，也不容易脏，而且因为是废物利用，所以更经济实用。
Some people have aims which are too high to achieve. They should come down to earth and be practical.
有些人定下的目标太高， 无法达到。他们应该脚踏实地， 讲求实际。
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