exist v. 生存，生活，继续存在
例句：He can hardly exist on the wage he gets; there is no money for luxuries.
existence n. 存在，实在物
例句：Pollution poses a threat to the continued existence of these species.
extinct adj. 灭绝的，耗尽的
例句：Dinosaurs have been extinct for millions of years.
extinguish vt. 熄灭，消失，压制
例句：Nothing could extinguish his faith in human nature.
quench vt. 结束，熄灭，淬火 vi. 熄灭，平息
例句：Having a bottle of soft drink is not enough to quench his thirst.
instinct n. 本能
例句：It's a mother's instinct to protect her baby.
intuition n. 直觉，直觉的知识
例句：She bad an intuition that there was something wrong.
tuition n. 学费
例句：He pays for her board and lodging, while his uncle finds her in tuition.
intrinsic adj. 内在的，本质的。
例句：My daughter has a natural and intrinsic talent and skill.