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。

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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。

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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。

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The bank levy approach focuses on banks and bailouts, whereas an FTT focuses on putting sand in the wheels of speculators in addition to banks.

FORBES: European Union To Talk Bank Levy, Financial Transaction Tax

Use a shovel to clear snow out of the way of the wheels and pour cat litter, sand or gravel in front of the wheels to help get traction.

BBC: How to drive in snow and icy weather

Snap-up bank-note holders that press while they sterilise are also available, as are bug-killing tissues, floors, wallpaper, stuffed toys, bicycle child seats, sand boxes, origami paper and steering wheels.

ECONOMIST: The Japanese are a super-clean lot. Obsessively so?