If you till, wait until the soil is warm and dry enough. If the soil stays together in a ball, it is too wet to till.

耕作要等到土壤充分温暖干燥。如果土壤还黏成球状，意味着土壤太湿不能耕作。

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Once it reaches the surface of the soil, the slug undergoes another transformation: Most of the cells turn into a stiff stalk, while the others crawl to the top and form a sticky ball of spores.

一旦接触土壤表面，这条“鼻涕虫”就会发生另一种变形：大部分细胞变成一个硬柄，其余则的爬到顶端形成一个黏黏的孢子球。

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Five paces from him the dry soil was thrown up , as a cannon ball sank into the earth.

离他五步远的地方，一颗炮弹炸开了干土，然后就消失了。

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Dr Abrahamson believes that ball-lightning forms when a conventional lightning strike vaporises carbon and silicon oxides found in soil.

ECONOMIST: Ball lightning

Playing with a newfound calm and touch, Altidore collected the ball, held it just long enough for Dempsey to break free, then laid off a perfect ball that Dempsey slammed into the lower left corner for a goal that left the Azzurri dumbfounded on home soil.

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