preserve的用法：
用作动词 (v.)
用作及物动词：
S+～+ n./pron.
We must preserve our natural resources.
我们必须保护自然资源。
The ship is equipped with special refrigerating devices to preserve food.
船上有特设的冷藏设备,用来保存食物。
It was his firm conviction that every effort should be made to preserve world peace.
他坚信应尽一切努力维护世界和平。