我国文化走出去的问题:why America have cutting- edge technology

why America have cutting- edge technology have a power cut 这个词组是什么意思 I have been asked to have the tree cut down. I have only been in America ____ two year America 's opinion :should iran have nuclear weapons have the tree cut down和cut down the tree 区别在哪里？ i have to cut in line什么意思?? In what ____are you going to have your hair cut? have your hair cut剪发 还有没有别的说法 @@@@ Why we Chinese have own new year???@@@