在需氧体系中, 氧是末端电子接受体并且被还原.In aerobic systems, oxygen is the terminal electron acceptor and is reduced.许多天然纤维在需氧菌的侵袭下则迅速腐坏.Many natural fibers decay rapidly when exposed to aerobic cultures.幽门杆菌是一只革兰氏阴性螺旋菌, 生活在微需氧的环境下.Helico...
He heard the sharp crack of a twig.他听到树枝清脆的断裂声。He shifted his weight and a twig snapped.他挪了一下身体的重心，一根树枝咔嚓一声断了。The other end of the twig is sharpened into a sharp point to use as a toothpick.细枝的另一端被削尖用作牙签。Current twig and...
公立学校的主要问题是教师的薪资太低。The state schools' main problem is that teachers' pay is so bad.现在好像是自由评论教师的开放期。It seems to be open season on teachers now.教师的忠告启发我深思.The teacher's advice gave me plenty of food for thoug...