cells principal的用法和樣例：
例句
- Chief cells make and secrete pepsinogen.
主細胞制造和分泌胃蛋白酶原。 - Tight junctions between adjacent principal cells permit the formation of a specific microenvironment in the lumen of the epididymis that is essential for sperm maturation.
主細胞之間的緊密連接將附睪管腔形成一個(gè)特殊的微環(huán)境以促進(jìn)精子成熟。
