一位听众想知道单词 “locate、position、orientate” 作动词时的区别。它们的意思都与 “位置，方位” 有关，但用法不同。动词 “locate” 可以表示 “确定人或物的位置”；动词 “position” 的意思是 “将事物小心地放在确切的位置上”；动词 “orientate” 的意思是 ...

Lower back pain is the single leading cause of disability in 160 countries, according to the World Health Organization. It is often caused by degenerative disc disease, a progressive and irreversible ...