In children and adolescents, there is an additional narrow portion between the epiphysis and the diaphysis called the metaphysis.

在儿童和青少年中，骨骺与骨干之间还有一个狭窄的部分，称为干骺端。

The only hope for avoiding a grueling six month wagon journey was to travel the narrowest portion of the continent— the 48-kilometer Isthmus of Panama.

避免六个月的艰苦旅行的唯一希望是穿越大陆最狭窄的部分——48 公里的巴拿马地峡。