这些模因之所以经久不衰，是因为它们由于某种原因而令人难忘。
These memes have longevity because they are memorable for one reason or another.
这个湖里的水非常咸，因而不能饮用，所以，他们就开凿运河从山上引水。
The lake water was too salty to use. So they built a system of canals to bring water down from the mountains.
所以，这类工具的开发导致PLM系统的复杂而昂贵，因而饱受诟病。
So, justification of the deployment of these tools created a stigma of complicated and expensive PLM environment.
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