drop out

中文解释：退出，退学

例句： There is a fact existed that there are more girls than boys who drop out from schools in many undeveloped and developing countries.

pivotal vs. vital

[‘pivətl; ‘pivətəl] vs. [‘vaitl; ‘vaitəl]

中文解释： adj. 重要的，关键的； vs. adj. 至关重要的，生死攸关的

例句： Nowadays, space technology have been played pivotal roles in daily routines, for instance, GPS navigations, etc. However, it is vital that governments should make approiate use in order to keep out of reach of illegal offences.