If there is no proper available spring wire, rubber band instead of spring made of simple rubber band dynamometer.

如果没有适当的弹簧钢丝，可用橡皮筋代替弹簧制成简易橡皮筋测力计。

youdao

If there is no proper available spring wire, rubber band instead of spring made of simple rubber band dynamometer.

如果没有适当的弹簧钢丝，可用橡皮筋代替弹簧制成简易橡皮筋测力计。

youdao