He entered for many competitions, winning several gold medals.他参加过多次比赛，赢得了数枚金牌。This little ball of gold weighs a quarter of an ounce.这个小金球重0.25盎司。The boys were as good as gold on our walk.我们散步的时候，这帮小男孩表现得很乖。...
...a gold mine at Orkney, south-west of Johannesburg.位于约翰内斯堡西南奥克尼地区的一座金矿On her shoulders she wore two ornaments exquisitely set in gold - work.她在肩上挂上两件精美的金工饰品....gold and silver plate, jewellery, and roomfuls of antique ...
For this reason the cycloid is called the tautochrone.由于这个缘故,摆线又叫做等时曲线.The vibration performance of cycloid ball planetary reducer was analyzed.分析摆线钢球行星传动减速器的振动特性.Double crank four ring - plate type cycloid drive is a ne...