The earliest record of pirates appeared in 1350 BC, which was recorded on a clay tablet. Greek merchants were occasionally attacked by pirates when they…

　　23-year-old Xiao Liu and his friend invited to play basketball together. He was highly myopic, and he deliberately took off his glasses in order to…

　　In patients with coronary heart disease, the coronary arteries have been significantly narrowed, blood supply is insufficient, and excessive exercise may cause acute angina pectoris…