This section establishes the need for the project; state primary and secondary audience.
本段在确立此专题的必须性，并说明首要与次要读者。
Do you think the English lessons in secondary school suit your need?
中学阶段的英文课，对你的英语学习是否足够？
The need to water of man is secondary to oxygen.
人对水的需要仅次于氧气。
Incoming Telephone lines: Do you need Primary or Secondary Protection?
线提供初级保护或次级防护？
Some secondary batteries need to store for a long time to meet special demands.
由于特殊需要，一些蓄电池要进行长期贮存。
Some secondary batteries need to store for a long time to meet special demands.
由于特殊需要，一些蓄电池要进行长期贮存。
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