英语语法分析

The gonads open near the base of the abdomen and the excretory organs are usually Malpighian tubules.

生殖腺开口于近腹部基部，排泄器官通常为马氏管。

The results indicate that the pathogen occurs in the midgut, fat bodies, malpighian tubules and nerve cells of the host.

结果表明：该微孢子虫可侵染棉铃虫的中肠、马氏管、脂肪体、神经等组织；

Malassezia can breakdown lipid like esterase, and result in morphological changes of malpighian cell and cell apoptosis, these are all their main etiological factors.

马拉色菌能像酯酶一样分解脂质，而且可引起角质形成细胞形态学改变和细胞凋亡，这些都是它的主要致病因素。