conundrum= a confusing and difficult problem or question，复杂难解的问题，可数
How to balance development and environmental protection is a conundrum faced by many modern governments.
utilitarian实用主义的（altruistic是“无私的”的意思，注意二者的区别）
Those working on a construction site（建筑工地）should wear utilitarian clothes that won’t interfere with their work.
endorse= declare one’s public approval or support of sth，（公开地）支持或赞同某事物，vt
This candidate has been endorsed by many prominent GOP members.
impulse= a sudden strong and unreflective（未经反思的）urge or desire to act.冲动，可数
Kant noted that people’s seemingly altruistic behavior is in fact motivated by their secret impulse of self-love.
in the same vein=likewise=similarly
Mike believes people can only benefit themselves by helping others. In the same vein， Joe argues that only by serving others can the whole society develop.
be discontented with sth对某事物不满
Joe is discontented with his loneliness but he is not willing to spare any time to find a girlfriend.
tiresome= causing one to feel bored or annoyed.令人厌倦的
Joe posts many selfies and remarks on WeChat moments every day, which makes him a tiresome person.
Juvenile作adj除了可以作“青少年的”讲，还可以作“childish、immature”讲
Joe’s mother-in-law thinks Joe is very juvenile and talks too much.
don=wear穿（戴）上，vt
Don’t don rose-colored classes when considering your own situation.
