饲槽和饮水器位置合适可以提高成绩.Proper orientation of feeders and waterers promotes good performance.这个“鸟类饮水器”中水深的增加应该非常缓慢, 最深处不超过10厘米.The birdbath should deepen very gradually, to no more than 3.我在哪儿能找到喷泉式饮水器?Where can I find a water ...
On average each report requires 1,000 hours to prepare.准备一份报告平均需要1,000小时。Every tonne of coal contains, on average, 30 kilograms of nitrogen.每吨煤平均含30公斤氮.We received 20 calls a day on average.我们平均每天接到二十个电话....