写一个观察器主要需要如下三大块。
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.
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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