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| 11. | They are adapted for rough, heavy service. |
| 它们适用于粗糙、繁重的工作。 |
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| 12. | An unpleasant or burdensome task. |
| 令人讨厌的或繁重的工作 |
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| 13. | peak period demand on the transportation system |
| 最繁重时期运输系统的负担 |
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| 14. | unremitting care, boredom, drudgery |
| 无休止的操心、 厌倦感、 繁重工作. |
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| 15. | exert a force with a heavy weight. |
| 竭尽繁重的力量施加压力。 |
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| 16. | demanding little effort; not burdensome. |
| 需要很少的努力；不繁重。 |
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| 17. | designed for heavy work. |
| 设计用来做繁重的工作。 |
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| 18. | not designed for heavy work. |
| 不是用来做繁重工作的。 |
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| 19. | made heavy or weighted down with weariness. |
| 繁重或者被疲劳所压垮。 |
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| 20. | have/take a rest from all your hard work |
| 放下繁重的工作休息一下 |
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