She began to menstruate regularly at 13 at intervals of 28～32 days with slight dysmenorrheal.她于13岁开始有正常的月经,周期为28～32天,有轻度的月经痛.She began to menstruate regularly at 13 at intervals of 28~32 days with slight dysmenorrheal.她于...
It is a sneaky and underhand way of doing business.这种做生意的方式偷偷摸摸，遮遮掩掩。That was a sneaky trick!这种把戏可不够光明正大！You bachelors are really sneaky.你们没结婚的人太不老实....