Useless Conversation落日幻影
useless species无益种类
make useless毁坏;破坏;破灭;毁灭
useless s无用的;无效的;无益的;除非
certainly useless必然是无益的
maybe useless日;常
Useless cry再哭也没用
be useless得物无所用
useless effort徒劳
ADJ（形容词） If something is useless, you cannot use it. (指某物) 不能用的
He realized that their money was useless in this country.
他意识到他们的货币在这个国家不能用。
ADJ（形容词） If something is useless, it does not achieve anything helpful or good. 没用的; 不起作用的
She knew it was useless to protest.
她知道抗议是没用的。
ADJ（形容词） If you say that someone or something is useless, you mean that they are no good at all. (人或物) 不行的
Their education system is useless.
他们的教育制度一点儿也不好。
ADJ（形容词） If someone feels useless, they feel bad because they are unable to help someone or achieve anything. (某人感到) 没用的
She sits at home all day, watching TV and feeling useless.
她整天坐在家里，看电视、感到自己没用。