ectomorph

The majority of boys was in mesomorph and ectomorph.

男孩大多属中、外胚层体型；

Of or relating to an ectomorph.

瘦型体质者的或与之有关的

"ectomorph:an individual having a lean, slightly muscular body build in which tissues derived from the embryonic ectoderm predominate."

瘦型体质者:由胚胎胚层发育而成的组织形成的瘦型的、肌肉不发达的人.

ectomorph

n. 瘦长而肌肉不发达的人