main block

FSH is a follicle assembly launch and follicular atresia in the degradation of the main block, and promotes more follicles mature to the preovulatory stage; LH promotes ovulation of preovulatory follicles.

FSH是卵泡征集的发动者和卵泡闭锁退化的主要阻止者，促进更多的卵泡发育成熟到排卵前阶段；而LH则促进排卵前卵泡的排卵[2]。

A large piece of ice broke away from the main block.

一大块冰从整个大冰块上断裂开来.

With review of the deficiency in the reproduction and construction of small concrete hollow blocks, four types of block were presented including main block, accessorial block as well as bottom block.

针对当前混凝土小型空心砌块块型在生产和施工中存在的不足，本文介绍包括主、辅砌块及芯柱底块在内的4种块型设计。

Extra classrooms were built out beside the main block.

大楼边上又扩建了一些教室.