And they could tell they came from land plants, and not aquatic plants, because the spores had a thick covering that all land plant spores have today.

他们可以看出它们来自陆生植物，而不是水生植物， 因为孢子有一层厚厚的覆盖物， 今天所有的陆生植物孢子都有。

The little brown seeds are packed snugly in the core at the centre of the apple, and all round about them there is a thick white covering which is sweet and juicy and good to eat.

小小的褐色种子, 紧紧地挤在苹果的中间, 周围是一层厚厚的白色外衣, 味道又甜, 汁水又多, 可好吃了。

The tree made a good, thick covering to protect them from the dew, and the Tin Woodman chopped a great pile of wood with his axe and Dorothy built a splendid fire that warmed her and made her feel less lonely.

这株大树长得高大茂密，茂密的枝叶为他们遮挡露水。 铁皮人用他的斧头，砍了一大堆木柴，多萝茜燃起一堆火来，这让她觉得不是那么寂寞。