一团粉尘在他周围扬起。The powdery dust rose in a cloud around him.暴风雪夹着大团的积雪吹过湖面。A blizzard was blasting great drifts of snow across the lake.他一把扯下那女孩的照片，将它揉成一团。He tore down the girl's photograph, and crumpled it into a ball....
The haemoglobin molecule contains only four atoms of iron.血红蛋白分子只含有四个铁原子.Anaemia is a condition in which there is a reduced concentration of haemoglobin in the blood.贫血是在血液里血红蛋白的浓度减少的一种病症.Iron - is a component of haemogl...