After it had stopped snowing, we all went sledging.雪停了以后我们全去坐雪橇玩.Our hill is marvellous for sledging and we always have snow in January.在我们的那座小山上滑雪橇最棒了，而且1月我们那里总会下雪。The Olympic winter Games have to include skiing, ice - ...
On the descents, cyclists spin past cars, freewheeling downhill at tremendous speed.在坡道上，自行车手飞驰着超越了一辆辆汽车，靠着惯性一路疾冲下山。The Danes made numerous descents upon the English coast during the 10 th century.在第十世纪中,丹麦人曾对英国沿海作无数次的突袭...
Insulin is produced commercially from animals.为获利从动物体内提取胰岛素。Insulin is secreted by the pancreas.胰岛素是胰腺分泌的。Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的....