These will do nicely. Now I must make a scale beam and a post.

“很不错。现在我要做一个秤杆和秤砣。

Next, he put the beam into a little groove at the top of the post, so that it would balance nicely.

再把秤杆插到顶端一个小槽里。样就能让它保持很衡。

Herbert worked away until he had made the beam and the post.

赫伯特一直在弄，直到把秤杆和刻度做。

We must put four threads to each cup; then we will tie the threads to the ends of the beam.

我们必须在每个杯子上穿四根线，然后把线系到秤杆尾端。”