他边听边点头，还吸着一支粗短的烟斗。He nodded and puffed on a stubby pipe as he listened.他抽了口烟斗，摇了摇头。He took a puff on his pipe and shook his head.房间内有烟斗烟丝的淡淡馨香。The room held the faint, sweet odour of pipe tobacco....
这样的幼苗具有伸长的下胚轴或上胚轴的特征.Such seedlings are characterized by having elongated hypocotyls or epicotyls.萌发开始时, 下胚轴依靠细胞增大而迅速伸长.At the onset of germination, the hypocotyl elongates rapidly by cell enlargement.有人发现,钙能抑制黄瓜胚轴的伸长.It...