She is a very active octogenarian.她已经是八旬老人了，还很精神。Each agent can provide with active service and intelligent search.本文中的Agent从功能上来讲主要是作人工助手,具体地说,每个节点的Agent提供主动服务和智能搜索功能....molten lava from an active volcano.活火山喷出的熔岩The Ch...
Some acids are strong enough to burn the wood.有些酸的酸性强得可以烧坏木头.There are many amino acids that the body cannot synthesise itself.有许多种氨基酸人体自身不能合成.How do acids react on metals?酸对金属会起什么样的化学反应?...