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and they have not a dreary commitment to mean ambitions or love of comfort.

他們既不追逐卑鄙的名利，也不貪圖生活的舒適。

Beyond two or three days, the world's best weather forecasts are speculative,

世界上最好的兩三天以上的天氣預報具有很強的猜測性，

The turtle at last gives up by pulling his feet under his shell and the game is over.

海龜終于屈服了，將4條腿縮進殼內。

He mentally visualizes a complex form from all round itself;

他的大腦能從物體周圍的各個角度勾畫出其復雜的形象，

But can we blame those who looked and failed to see what Galileo saw, if we remember that to use a telescope at the limit of its powers calls for long experience and intimate familiarity with one's instrument?

但是，如果我們想到，便用一架倍數有限的望遠鏡需要長期的經驗和對自己儀器的熟悉程度，那么我們怎么能去責備觀察了天空但沒有看到伽利略所看到的東西的那些人呢？

a trough (the lowest point), a height (the vertical distance from the trough to the crest),

波谷（最低點）、浪高（從波谷到浪峰的垂直距離）