n.（鸟、昆虫、蚯蚓等的）前胃
Chyme pH in crop, proventriculus and gizzard increase gradually with age.
结果表明, 嗉囊、腺胃和肌胃内食糜pH随 日龄逐渐增加,而小肠内食糜pH随 日龄变化不大.
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