他看见墓碑上有一些黑字写的东西。He saw something written in black on the gravestones.文森特赫然耸现在我面前，面色灰白得像一块墓碑。Vincent loomed over me, as pale and grey as a tombstone.我拂去了墓碑顶上的雨水。I swept rainwater off the flat top of a gravestone....
它对氟离子的选择性比其它普通阴离子高几千倍.It'shows a thousandfold selectivity for fluoride over other common anions.比色法涉及氟离子对预先形成的颜色的消色作用.The colorimetric methods involve the bleaching of a preformed color by the fluoride ion.阐述用氟离子选择电...
举行流行音乐演唱会to do a gig该乐队举行了13场全国巡回演唱会，其中包括在纽约的一站。The group made a 13-concert cross-country tour, including a stop in New York.他在他的酒店举行了一场历时3个钟头的家庭卡拉OK演唱会，其间高歌了辛纳屈和甲壳虫乐队的一些热门歌曲。He held a three-hour family Karaoke session i...