| 1. | Phosphorus is essential to plant growth .
植物生长需要磷。 |
| 2. | This wealth was essential to the support of learning .
这种财富对于学术活动是不可少的。 |
| 3. | What he had fancied was essential to my sense of proportion .
他原先认为必须那样才能使我懂得分寸。 |
| 4. | In criticism , it is essential to guard against subjectivism and arbitrariness .
批评要防止主观武断。 |
| 5. | It might be so essential to a scheme on which they had set their hearts .
这件事对他们热衷的计划是那么重要。 |
| 6. | In our pioneering days this aggressiveness was essential to survival .
在开拓时期，这种进攻性是生存的必要条件。 |
| 7. | Nitrogen manuring is essential to get a good yield of cut herbage .
为了获得刈割牧草良好的产量，使用氮肥是极为重要的。 |
| 8. | The tunipah development is essential to the growth and prosperity of california .
图尼帕工程对加州的发展和繁荣至关重要。 |
| 9. | His support was essential to steer military appropriations through the congress .
他的支持实质上是要使国会通过军事拨款。 |
| 10. | It is therefore essential to know the age distribution in the population .
所以，了解在该种群中的年龄组配状况是很重要的。 |
