He panned over the crowd for a few minutes before swivelling back to the right.他从头到尾移动拍摄了那群人好几分钟，才转回右侧。Where the vehicle has swivelling wheels they shall be placed in the most onerous position.装有旋转轮的车子须将旋转轮调到最易倾翻的位置....
...improving the yield of the crop...提高农作物产量When the summer crop is ripening, the autumn crop has to be sowed.夏季作物成熟时, 就得播种秋季作物.The islanders could barely survive without an export crop.没有出口作物，岛上的居民几乎无法生存。It also demonst...
你用的胶卷感光度是多少?What's the speed of the film you're using?从理论上来讲, 数码相机的感光度越高,拍摄效果越好.Theoretically speaking, the higher sensitivity of digital camera to photograph the better.和我们用普通胶卷时的感光度差不多.And we use sensitivity ...