essential

例句与用法

Careful reconnaissance is essential before observations begin .
观测开始之前的一项主要工作是认真选点。
Job satisfaction is essential if we are to work efficiently .
要使工作卓有成效，必须保证工作时得心应手。
Strict adherence to nipple hygiene is essential during breast feeding .
在哺乳期要严格保持乳头的清洁卫生。
Electron spin is essential in understanding many atomic phenomena .
电子自旋对于理解许多原子现象是很重要的。
Agriculture is one of the oldest and most essential of human pursuits .
农业是人类最古老、最基本的产业之一。
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。
It is essential that my judgment should be balanced and my brain clear .
我的判断必须全面，我的头脑必须清醒。
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。
There is still great interest in boron as an essential plant nutrient .
迄今硼作为植物的必要营养元素仍极其重要。
It is however essential that i play out the string and not be provocative .
但是我必须放缓和一些，而不能搞挑衅。