The chopstick I poked your arm with is on the floor.直译:我戳你的那根筷子现在在地板上.A 20 - year old tree could produce 3000 - 4000 pairs of chopstick.一棵生长了20年的大树,仅能制成3000至4000双筷子.He put the chopstick and watched as the bee dried out.他...
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...