It's a waste of energy cutting this grass－nobody's going to see it.割这些草纯粹是浪费精力 － 根本没有人会注意。We don't want to waste our energy trying to persuade people who are just not interested.我们不想浪费精力去试图说服根本毫无兴趣的人。Some grumbled that Johnson was more trouble than he was worth.有人抱怨说根本不值得为约翰逊浪费精力。