西悉尼大学博士申请:"never offer to teach the fish to swim"的成语意思

"never offer to teach the fish to swim"的成语意思 never offer to teach the fish to swim "I never had a dream come ture,I never had a word to say"这是谁的歌? 是offer sb sth还是 offer sb to do sth? never to carzy never late to learn never to drive not to =never ? The man who made up his mind to win will never sar "impossible" "One is never too old to mend" 这句话是什么意思？