Wind turbines operate on a simple principle.
风力涡轮机的工作原理很简单。
But I want to emphasize that these reforms are rooted in a simple principle.
但是我要强调的是，这些变革都基于一个简单的准则。
Let me warn you that it may be a simple principle, but it is not always an easy one to apply.
请允许我提醒你，这也许是一个简单的原则，但又不总那么易于实施。
Many people may also not such a simple mechanical principle.
可能很多人还不清楚这种简单机械的原理。
He ate the principle of "simple", is a favorite of home-style meal Lurou;
他对于吃的原则是“简便”，最爱吃的是家常的卤肉饭；
This is a very simple principle, but unfortunately people have overlooked it.
这种道理是很浅显的，可惜被人忽略。
This is a very simple principle, but unfortunately people have overlooked it.
这种道理是很浅显的，可惜被人忽略。
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