involve – include 包括
numerous – a number of – a lot of – abundant (B 级) – plentiful 大量的, 丰富的
stay –remain 保持(用作半系动词)
rest – break 休息
account for – explain 解释
examination – test 测试， 考试
examine – check up 检查， 核对
gain – put on 增加
put up – lift – raise 举起
put up – build – construct 建造
relieve -- lessen 减轻，减少
severe –serious -- bad 严重的
severe – strict 严厉的
sharp– acute – severe 剧烈的(疼痛)
severe – hard - tough艰苦的
