| 1. | Adjust scale if necessary so it is balanced .
需要时再挪准磅秤使之平衡。 |
| 2. | He helped me in my hour of need .
他在我需要时帮助过我。 |
| 3. | Instead, ad-hoc groups are formed as the need arises .
相反地，只是在需要时成立一些特别小组。 |
| 4. | If desired, the perturbed wave function may be normalized at the end of the calculation .
当需要时，可在计算最后将微拢波函数归一化。 |
| 5. | It may also provide drainage and give added protection against frost action when necessary .
它具有排水作用，但在需要时也增加保护抗冻作用。 |
| 6. | The bonds, which were introduced in 1956, are in units of one pound and are redeemable at face value on demand .
这种债券始于1956年，以一英镑为单位，需要时可按面值兑现。 |
| 7. | Heart failure is said to occur when the heart is unable to pump blood at a rate sufficient to meet requirement of the tissues .
当心脏搏出血液的速度不能满足组织需要时，就发生心力衰竭。 |
| 8. | The use of such combinations is advantageous only if the ratio of the fixed doses corresponds to the needs of the individual patient .
只有当固定剂量的比例符合患者的需要时，应用这种合剂才能见效。 |
| 9. | Mitochondria convert the chemical energy of carbohydrates and fats into energy forms which the rest of the cell can use when needed .
线粒体可将脂肪与碳水化合物的化学能转化为细胞的其余部分需要时可以利用的能源形式。 |
| 10. | Among these i would only list string and brown paper kept by thrifty people when a parcel has been opened, to save buying these two requisites .
在这些例子中我只举其中之一，有些勤俭节约的人在打开包裹纸盒后总是将绳线和牛皮纸收藏起来，免得将来需要时再去买。 |
