Light is essential for the healthy development of plants.
光对于植物的健康成长是必不可少的。
Nitrogen is an essential food for plants.
氮是植物一种必不可少的养分。
A cooling tower is one of the essential facilities in electric plants.
在火力发电厂中，冷却塔是必不可少的设备之一。
And during the design and construction of these plants, plotting is the essential part.
在水电站的设计及建设过程中，测绘工作贯穿始终，是必不可少的环节之一。
And during the design and construction of these plants, plotting is the essential part.
在水电站的设计及建设过程中，测绘工作贯穿始终，是必不可少的环节之一。
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