The shipping system of Heilongjiang river is the essential important component of the network of traffic and transportation of the Northeast China.

黑龙江水系的航运是东北地区综合交通运输网不可缺少的重要组成部分。

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Non-verbal symbols are essential to communication, and body language is an important component in non-verbal communication.

非言语符号是交流中必不可少的，而体势语是非言语交际的重要组成部分。

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Urban greenbelt landscapes are an important component of urban ecosystems. The study of urban greenbelt landscape is essential for quantifying and improving the quality of a city's environment.

城市绿地景观的格局分析是城市景观生态系统研究的重要内容和基本特色之一。

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Social work has been known as the helping profession for over a century and during that time has been an essential component of the social safety net, guiding people to critical resources, counseling them on important life decisions, and helping them reach their full potential.

WHITEHOUSE: The White House