两refer to both sides. we seldom use 则 in daily life. it only appears in ancient books or kinda official articles. but there is one possible situation 她弹钢琴很好，他则不行。 here 则 means but. there's comparing in the sentence. nice to meet u btw. im RIngo

两利 means win-win.peace is always a win-win situation. 两伤 means both sides suffer or both will be weakened by war. this is form classical chinese,so it's not very common in spoken language,but people use it sometimes.classical chinese is always terse for what it represents. 则 here is a causal conjunction."战"or"和" leads to different results:"两伤"or "两利".

they would be both hurt if they fight together, and it would be good for both of them if they not fight. this sentence means fight is not good for both of them. 和means piece ,it is the most important idea in the whole chinese ideologocal history this sentence is very old , if you never see it before,you can also know there are 4 characters in both of the sentence, the words are very neat and tidy.战and和,伤and利，they have both 则and 两. if you know how to read it,it is also beautiful.there is rhythm in it.. I can explain this sentence in moden chinese as follow 打起来的话，双方都会受伤；和好的话，对双方都有好处。 则 has many usages.is normally in writen chinese,you can instead of 那么，就会,in this sentence,it is means "then" in here in english.

the word 则 here means “if ......will be” or "would" the word 两 here means both,

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