英语翻译At the present time,the oceans are becoming increasingly important as potential sources of fresh water because of recent advances in devising economical and practical desalting processes .The United States government has participated in e

henry can't attend the meeting at present at the present at the present 英语翻译用“in the past”和“at present” at present 与 for the present 区别 Treasures at present the person at the present time与at present 的区别 at the present time ,at present ,now的区别` at the present time 和at present一个意思吗 at the moment & now & at present 是什么? 英语翻译全句：Looking back at the past life will be 500 times the present conflict in the present和at present有什么区别 in the present,at the present分别为什么意思?还有：in the present,at present,at the present这三个短语有什么区别?做题时应如何选择呢? at present=at the present time是否成立?还是at present=in the present time?那in the present time呢 at now等于at the moment 等于at present么 英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t in the present ,at the present,in the presence,at the presence的区别 at present