Periodically , the lamellae become enlarged, forming flattened, membrane - enclosed vesicles called thylakoids.片层周期性地扩展, 形成扁平的有膜为界的囊,称为类囊体.Mortality is the number or volume of trees periodically rendered unusable through...
我车子的左前轮撞在一大块松动的路缘石上，导致车胎爆裂、轮辋凹陷。A great chunk of loose kerbing smashed into my left-front wheel, bursting the tyre and denting the rim.他把轮胎安到轮辋上.He fitted the tire around the rim of the wheel.此外,我们还提供挂车及重型汽车轮胎和轮辋.We also...