他们曾在一处泉边停歇休息。They had stopped by a spring to refresh themselves.棕榈泉有高档的餐厅和奢华的夜生活。Palm Springs has ritzy restaurants and glitzy nightlife.这口泉号称从不干涸。The fountain is reputed never to dry up....
a grey, cloudy day灰暗多云的天空Only a tiny patch of blue was visible in the cloudy sky.多云的天空中只见到一小块儿湛蓝.Bob always enjoys sailing, even though the weather is cloudy.鲍勃总是很喜欢航行, 即使空中乌云密布....
方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.METHODS: The target compound was prepared by the bromination and amination reaction.用溴—甲醇溶解Al_2O_3, 其回收率在91%以上.If Al 2 O 3 is dissolved by Br 2 - CH 3 OH, its Recovery rate is above 91 %.用溴比用氯时产出率...