写一个观察器主要需要如下三大块。

There are three main parts in writing a visualizer.

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他看到机群分成三大块，组成一个完整的编队。

On his screen they appeared as three large blobs, one for each formation.

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我院教学体系设计有三大块：专业学分课程、EAP海外桥梁课程、标准化英语培训课程。

We have divided our study in three quarters: Specialized Courses; EAP Bridge Courses; Standard English Training.

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