重点讲解：
1. in response to 回复；回答；回应；
Dr. Holdren said he believes the U. S. is ready to take some difficult steps in response to climate change.
霍尔德伦教授说，他相信美国即将采取一些重要的手段来应对气候变化0d&~d*KXp7XU+AOO。
2. warn of 提醒注意（可能发生的事）；使警惕；
Police have warned of possible delays.
警方已经通知可能会廷期nGf_FprDQk-。
3. up to 高达；多达；
Up to twenty thousand students paid between five and six thousand dollars.
多达20,000名学生支付了5,000到6,000美元1Kbdx]rkB6。
4. out of control 失去控制；不受控制；
My impression is that they are totally out of control.
我的感觉是它们完全失去了控制I@lCj)7tdNI69*xM。