'æ以' is the word to introduce the reason, it is roughly equal to 'because'; 'äºæ¯' literally means 'from this' (I guess). It suggests something B happens after A, and A may or may not be one of the reason why B happened. For me, it is like the mixture of 'upon doing something above' and 'as a result'.
And No, they cannot be used interchangeably. Consider the following:
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所以 is more like.. "because"; because so-and-so happened.
于是 is like "and so more"; and so it's more like this that so-and-so.
'æ以' is the word to introduce the reason, it is roughly equal to 'because'; 'äºæ¯' literally means 'from this' (I guess). It suggests something B happens after A, and A may or may not be one of the reason why B happened. For me, it is like the mixture of 'upon doing something above' and 'as a result'.
And No, they cannot be used interchangeably. Consider the following:
“äºæ¯(yúshì)” indicates some results which are just next to the last thing and caused by it. It can also be “äºæ¶(yúshÃ)”, and it used as a conjunction to express sequential relation. For example: “ä¸ç¥ç·ç说äºä¸å¥ä»ä¹è¯ï¼äºæ¯å¥³çå°±ç¬äºã(bù zhÄ« nán de shuÅ le yà jù shénme huà , yúshì nÇ de jiù xià o le.)” “æ以(suóyÇ)” indicates cause and effect relation and it is always used with “å 为(yÄ«nwèi)”. For example: “å 为天ä¸é¨äºï¼æ以ä¸å¥½æ车ã(yÄ«nwèi tiÄn xià yÇ le, suóyÇ bù hÇo dÇ chÄ .)”
æ 以 is used when you can substitute "so" with "that's why".
äº æ¯ can be used to substitute "as a result".
"that's why" and "therefore"...