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- keep free of weeds (指土壤) 洁无杂草
- Clear an area of your garden free of weeds and other plants and then plant the shoot in a couple of inches of soil. 明确花园面积你免费杂草和其他植物,然后在植物的芽夫妇英寸的土壤。
- Must be kept free of contaminates for coating to adhere properly. 为了涂装的附着性必须保持没有污染。
- Nowadays we try to keep our rivers free of town and factory waste. 现在我们努力使河流不受城镇和工厂废物的污染。
- A thick growth of weeds covered the yard. 庭院长满浓密的野草。
- A rampant growth of weeds in the neglected yard. 杂草在未被妥善照管的院子里滋长
- free of weeds, contamination, pollution, etc 无杂草、 传染、 污染等.
- The abandoned garden was left to a wanton growth of weeds. 荒园里杂草丛生。
- Many city planners believe that cities,or at least their central areas,should be kept free of automobiles. 许多市政规划者认为，城市，至少是市中心，不应该有车辆通过。
- The area within 15 feet of any hydrogen container should be kept free of dry vegetation and combustible material. 任何氢容器的15英尺以内区域不能有干燥的植物和可燃材料。
- The streets have been swept free of leaves. 街上的落叶已打扫乾净。
- Many city planners believe that cities, or at least their central areas, should be kept free of automobiles. 许多市政规划者认为，城市，至少是市中心，不应该有车辆通过。
- Engine parts, particularly the piston, must be kept free of varnish to ensure performance and proper cooling. 发动机零件尤其是活塞，必须保持光泽以确保性能和正确的冷却。
- The present firehouse will be kept free of building all around, so that the four outside walls will be fully respected. 本消防站将保持自由各地的建设，从而使这四个外墙将得到充分尊重。
- There was a thick growth of weeds around there. 那一带杂草丛生。
- G. The area within 15 feet of any hydrogen container should be kept free of dry vegetation and combustible material. 任何氢容器的15英尺以内区域不能有干燥的植物和可燃材料。
- Together they worked out ways to get rid of weeds. 他们一道想出了除草的办法。
- I have tried to keep the wound free of infection. 我已想出办法不使伤口感染。
- They left the fields productive only of weeds. 他们离开了只生长野草的田地。
- If a body is kept free of the action of forces,it will remain in its state of rest or of uniform motion in a straight line. 物体如果不受外力的作用，将保持静止的状态或沿直线作匀速运动。
