| 1. | All necessary materials should be on hand . 一切必须的材料应准备就绪。 |
| 2. | I have not the gifts that are necessary for scholarship . 我没有做学问所必须的天资。 |
| 3. | More exchange between world leaders is needed . 世界各国领导人之间更多的交流是必须的。 |
| 4. | A give-and-take society should compromise here and there . 一个互相让步的社会遇事应达成必须的妥协。 |
| 5. | In the case of cotton processing, opening is necessary preliminary to cleaning . 在纺棉的情况下,开棉是除杂前必须的。 |
| 6. | It should be noted that a balance is not always required in a wind tunnel . 应该指出,天平对风洞来说并非是绝对必须的。 |
| 7. | Replication is necessary because site conditions are always somewhat variable . 重复是必须的,因为立地条件常常有些变化。 |
| 8. | The third parameter needed for an oil field to occur is the cap rock or seal . 形成油田所必须的第三个参数是盖层岩石或封闭层。 |
| 9. | The ability to produce is limited by the availability of the basic ingredients necessary for production . 生产的能力要受到生产所必须的基本构成要素供给的限制。 |
| 10. | Q represents the nonmetallic atoms necessary to complete a heterocyclic nucleus containing 5 atoms in the heterocyclic ring . Q是形成5个原子杂环核所必须的非金属原子。 |