| 1. | A good dictionary is indispensable for learning a foreign language. |
| 学习外语离不开好的词典。
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| 2. | Air, food and water are indispensable to life. |
| 空气, 食物, 水皆为生命不可或缺者。
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| 3. | The computer is now an indispensable tool in many businesses. |
| 目前计算机是很多公司不可或缺的用具。
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| 4. | Air and water are indispensable to [for] life. |
| 空气和水对于生命是必不可少的。
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| 5. | A good dictionary is indispensable for learning a foreign language. |
| 一部好词典对学习外语是不可或缺的。
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| 6. | Your help is indispensable for the success of the project. |
| 你的帮助对于这项规划的成功是必不可少的。
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| 7. | Fresh air during sleep is indispensable to health. |
| 睡眠时呼吸新鲜空气对于健康是必不可少的。
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| 8. | an indispensable [a necessary] preliminary to sth. |
| 某事开始前必需的一步。
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| 9. | Swiftness of action is indispensable to surprise. |
| 行动敏捷对奇袭是比不可少的。
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| 10. | Statistics is an indispensable tool for research in the social sciences. |
| 统计学是社会科学研究必不可少的工具。
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