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....
学生们分组研究复杂的问题。The students work in groups on complex problems.参加者按年龄分组。Participants were categorized according to age.你的工作是把他们按字母顺序分组，然后按数字顺序排序。Your job is to group them by letter and put them in numerical order....
The officer dismounted, tethering his horse to a tree.军官下了马，把它拴到一棵树上。We're often told that the world is tethering on the brink of destruction.我们经常被告知世界处于毁灭的边缘....
Indiana's legislators cast a suspicious eye toward Washington, passing a vehement resolution.印第安那州议员以怀疑的眼光来看华盛顿, 通过了一项措辞激烈的诀议案.The names of the ninety - nine legislators are being called off.要依次唱名 九十九 位议员.The mayor ...