因为我们不确定海星数量增加的原因,所以要预防就很难了。
Bcause we aren't sure of the causes for starfish population increases, it's difficult to prevent them.
你需要确定蜘蛛的数量。
为了建立这样一个年表,有必要确定地球过去不同时期存在的陆冰的相对数量。
To establish such a chronology, it is necessary to determine the relative amounts of land ice that existed at various times in the Earth's past.
You rotate the letters by a deterministic amount, by a fixed number of steps so that the end result is actually something that can be reversed.
你用确定的数量旋转那些字母,通过一个固定数量的步骤,这样,最终结果是可以把它,反加密出来。
Pick the number of spiders.
确定蜘蛛的数量。
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