The stem has a proximal stem portion and a distal stem portion.

所述杆具有近端杆部分和远端杆部分。

youdao

In fact, the scientists had mapped only a certain portion of the epigenomes of two cell types (an embryonic stem cell and another basic cell called a fibroblast).

事实上，科学家仅仅绘制了两种细胞外基因的某一部分而已。

youdao

Clean exposed portion of valve stem (Do not scratch).

清洗阀杆的外露部分(不要划伤)。

youdao

Traditionally, carvers "scalp" their pumpkins by cutting off the top stem portion, but Spost says leaving the top of the pumpkin intact gives you more eyebrow room to work with.

CNN: Carving up a spooky Halloween