viruses are relatively simple in structure. they consist of one or more molecules and are sometimes surrounded by a protein envelope - 蛋白 幅插畫檔、美工圖案、卡通及圖標
school education concept in cartoon style. drawing lesson at school. stretched canvas, painted picture with a seascape on a white background. stylish creative vector set. - 蛋白 幅插畫檔、美工圖案、卡通及圖標
absurd, overly strict requirements or restrictions. isometric view using tweezers to pick out a bone from a cracked egg - 蛋白 幅插畫檔、美工圖案、卡通及圖標
boiled egg isolated on white background. peeled boiled eggs isolated on white background. - 蛋白 幅插畫檔、美工圖案、卡通及圖標
