探矿者淘选从河床里挖出的少量含金泥沙和砂砾.The prospector panned out bits of sand and gravel scooped from the bed of a stream.探矿者淘选从河床中挖出的少量含金泥砂和沙砾.The prospector panned off bits of sand and gravel scooped from the bed of a stream....
Britain did not introduce compulsory primary education until 1880.直到1880年，英国才开始实行初等义务教育。Unions pledged to fight any compulsory redundancies "tooth and nail".工会许诺会“竭尽所能地”阻止任何强制裁员。They have campaigned strongly for compulso...
He tried the various almanacs, annuals and gazettes which were held in the library.他试着在图书馆里找过各种历书、年鉴和报纸。Annuals, as a general rule , are very responsive to phosphorus fertilization.通常说来,对一年生植物施用磷肥是相当有效的.Kudzu is a legumi...