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同学你好
1. preserve “保护”、”保存”、”维护”； 指使不受破坏，能长久保存下去。 (to keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed)
例子：
The ancient Egyptians knew of means to preserve dead bodies from decay.
古埃及人懂得如何保存尸体以防腐烂。
2.  conserve 保护、保存、保留、节约；强调对资源、有价值的东西珍惜节约，合理使用，常用于保护资源和野生动物。(to keep and protect something from damage, change, or waste so that it lasts for a long time)
例子
Effective measures must urgently be taken to conserve these endangered species of wild animals.
必须采取有效措施保护这些濒临灭绝的野生动物物种。
3. protect侧重保护不受外界伤害，比如
So, what can women do to protect themselves from heart disease?
那么，女性能做什么来保护自己不患心脏病呢？
4.reserve “保留”、“把……专门留给”， 指事先预留下来专用或以备后用 (to keep something for a particular purpose or time) 。 也可用于 “预订” 、“预约”房间、票、座位等。
例子
Don't take the seats in the first three rows, which are reserved for guests.
前三排座位不要坐人，是留给客人坐的。
祝学习愉快哦