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When I was a teenager, I felt that I was just young and uncertain --

我十幾歲時，總感到自己年輕，有些事拿不準 --

The holes are only borings, less than a foot in diameter.

這些洞只不過是一些鉆孔，直徑不到1英尺。

All this was comparatively slow until, with the coming of science, the tempo was suddenly raised.

所有這些發展都比較緩慢，而隨著科學的到來，增長的速度才突然加快。

And then, when they were dead, the carnivores, like the sabre-toothed cats and the giant wolves, came out to feed and suffered exactly the same fate.

大象死后，一些食肉動物，如劍齒虎和大灰狼就來吃大象，結果遭到了同樣的命運。

will finally become so steep that we can live no longer,

但最終會急轉直下，我們也無法再活下去了。

Alcohol may be a medical disinfectant, but should not be relied upon to sterilize water.

酒精可能是醫學上的消毒劑，但決不可用來消毒飲用水。