If you want to fill a bag with sand, you have to control a kind of truck on wheels and move it into the correct place.
如果你想把一个袋子装满沙子，你必须控制一种有轮子的卡车，并把它移到正确的位置。
Friction drives the wheels to go on the road, so car can be moved. If wheels are trapped in the mud or sand, they can not go.
车轮一定要走在有摩擦力的路面上，这样车子才能行动。若车轮落入泥浆沙坑之中，那就动弹不得矣。
The predicting formula of the drawbar pull of driven wheels running on the sand is obtained by model test.
通过模拟试验，得出了驱动轮在砂地上行驶时的挂钩牵引力预测公式。
The wheels laboured in the sand .
车轮在沙中空转（无法前进）。
The wheels labored in the sand.
车轮在沙里吃力地转动。
The wheels labored in the sand.
羚车轮在沙里吃力地转动。
Hi, you should not have driven the children away, for they were not to put sand in the wheels.
嗨，你不应该把那些孩子赶跑的，不是来捣乱的。
Hi, you should not have driven the children away, for they were not to put sand in the wheels.
嗨，你不应该把那些孩子赶跑的，不是来捣乱的。
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