45kg

1

In this examination , when the dosage of the water-keep-matter is 45kg / hm2 , the production increase effect is the best ;

在本试验条件下，保水剂使用量为45kg/hm2时，增产效果最好；
2

Conservationists describe how the bull elephant had intentionally hid in bushes to conceal his sweeping tusks , which were estimated to each weigh around 45kg .

自然资源保护学家描述了这头公象是如何故意躲在灌木丛中来隐藏它的长象牙。它的长象牙每个约重45千克。
3

Later on in the evening , the men are challenged to hold up a 45kg side of beef in the air for 20 seconds as their colleagues and friends count down , cheer and take pictures with their BlackBerrys .

晚上稍晚一点，男人们要面对一项挑战把一扇45公斤重的牛肉举在空中20秒，这时他们的同事和朋友会倒计时、欢呼并纷纷用黑莓（blackberry）拍照。