at the edge of sth在。。。的边缘 run after 追赶,追求 in one's possession拥有。。。continued to do/doing继续做。。。rush up to赶着去做,急于做。。。 take the risk冒险difficulty只能作名词,但有可数与不可数之分,表示“困难,难题,难事,困境”,可数,表示“困难,费劲,辛苦”,不可数。be able to 有做。。。的能力,能做 no more 等于not 。。。any more order sb to do sth命令/吩咐某人做某事 这些牛津高阶英汉双解词典上都有