1·Let's do an experiment. You all have a beaker half full with water, a forcemeter, and a 50g weight on your desk.
现在让我们来做个实验：你们桌上都有一个装了半杯水的烧杯，一个测力计，一个50克的法码。
1·Let's do an experiment. You all have a beaker half full with water, a forcemeter, and a 50g weight on your desk.
现在让我们来做个实验：你们桌上都有一个装了半杯水的烧杯，一个测力计，一个50克的法码。