I'll just play until the janitor comes round to turn the lights out.我会一直玩到门房过来熄灯。That janitor is a snail who never gets things done.那个照管房屋的人动作慢吞吞的,什么事也做不成.The janitor comes round to turn the lights out.看门人巡视一圈，把灯熄灭。...
There are several other excretory mechanisms in earthworms.蚯蚓有好几种排泄机制.In the earthworm and many other invertebrates, these excretory structures are called nephridia.在蚯蚓和许多其它无脊椎动物中, 这些排泄结构称为肾管.Describe the excretory syste...
她在自己熟悉的领域里对自己的行为有十足的把握。On her own ground she knows exactly what she's doing.他避开了最棘手的问题，将精力集中于有可能达成一致的领域。He skirted the hardest issues, concentrating on areas of possible agreement.他们在各自的领域都被视为专家。They are each recogn...