指从日落到就寝时。还有傍晚、黄昏之意。night(“夜,晚上”之意)指从日落至次日日出为止。
Good evening.晚上好。是用于晚上见面时向对方问候的,Good night.晚安。是用于晚上跟对方告别或睡觉前说的
I can’t sleep well at night.不能用in the evening ,因为evening指从日落到就寝时
have a cold患感冒 have a bad / terrible cold患重感冒
have a fever, have a cough, have the flu, have sore eyes,
have a toothache, have a backache, have a stomachache