新概念4的句子18课Almost any day a young porpoise may be seen trying
新概念4的句子18课
Almost any day a young porpoise may be seen tryingto turn a 300-pound sea turtle over by sticking his snout under the edge of his shell and pushing up for dear life. 这里的 push up for dear life神马意思? edge of his shell 又是神马意思?