The slate is not at all like the lump of putty which we made.

板石, 跟我们以前子块儿, 一点也不像。

The putty was soft; we could press it into any shape we pleased. But the slate is hard.

子是很软, 我们想要什么形状, 就可以把它捏成什么形状。

He first cuts away the hard stuff which holds the old glass in its place.

他先把旧玻璃周硬硬东西切下来, 这种硬东西叫子, 也叫油灰。

This hard stuff is called putty. Then with some fresh putty he fixes in the new pane.

然后再在窗框上抹上一些新子, 把新玻璃装上去。

The putty did not break when it fell to the ground; but if we drop a slate, it will break.

子块儿掉在地上是不会碎, 可要是把一块板石掉到地上就会摔碎。

In a few minutes we shall get a lump of soft putty.

几分钟, 一块子就好了！

What is putty? Let us try to make some for ourselves, and then we shall know all about it.

子是什么呀? 咱们可以自己试着一, 这样就都明白了！

But why is this putty so useful?

但是, 子怎么会这么有用呢?

Notice, first, how you can mould or press it into any shape you please.

第一, 你可以把子塑成或者压成各种各样形状。

If the bones are broken, glue and putty are used to put them back together.

如果骨头断了，可以用胶水和子将它们重新组合起来。

As soon as the putty is made, it begins to dry and to turn hard.

子一好了, 就会变干变硬。

The water cannot get through the putty which holds the panes in their places.

窗玻璃让子黏住了, 雨水透不子。

For example, a screwdriver can be used to screw in a screw, but it's great for scraping putty off the wall.

例如， 螺丝刀可以用来拧螺丝，但它非常适合刮掉墙上子。