Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 ( actinium ) through 103 ( lawrencium ).锕类任何化学性质相似, 原子序数在89 ( 锕 ) 与103 ( 铹 ) 之间变化的放射性元素.The extraction mechanism and separat...
Ink particles attach themselves to air bubbles and rise to the surface.墨汁颗粒附着在气泡上，浮到表面上。She dipped a quill in ink, then began to write.她将羽毛笔在墨水里蘸了一下，随后开始书写。The ink had run on the wet paper.墨迹在湿纸上浸开了。...
Glaciers are moving rivers of ice.冰河是犹如河水般流动的巨大冰体。Glaciers gouged out valleys from the hills.冰川把丘陵地带冲出一条条山谷.It has ice and snow glaciers, rainforests and beautiful mountains.既有冰川, 又有雨林和秀丽的山峰....
库克叫这只狗的名字时，它的耳朵就会稍稍耷拉一下。The dog's ears flattened slightly as Cook spoke his name.它的叶子在灼热的阳光下微微耷拉着。Its leaves drooped a little in the fierce heat of the sun.他的舌头从嘴角耷拉出来。His tongue was lolling out of the side of his m...
He poled the raft down the river.他用篙撑筏沿江而下.He has surrounded himself with a raft of advisers who are very radical...他周围聚集了一大群偏激的顾问。'Are you sure the raft is safe?' she asked anxiously. 'Couldn't be sa...