It becomes hard and takes a definite shape.

它变硬并形成一定的形状。

Again the shadow round this strange man seemed to me to be taking more definite shape.

在我看来，这个陌生人周围的影子再次变得更加明确。

But rather than being a dot that is in an orbit, it's sort of spread out in a very definite shape around that atom.

但它不是在轨道上的一个点，而是在那个原子周围以非常明确的形状散布开来。

Then gradually her ideas took definite shape, and, sitting on the grass that she dug up with little prods of her sunshade, Emma repeated to herself, " Good heavens! Why did I marry" ?

后来，思想慢慢集中了，她坐在草地上，用阳伞的尖头一下又一下地拨开青草，翻来覆去地说：" 我的上帝！ 我为什么要结婚呀？"