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Sustainable forestry is not an option; it's our responsibility.
可持续林业不是一种选择,而是我们的责任。
You can't just sit there and wait for life to come to you. You have to go get it.
建筑不是关于形式,而是关于关系。
电子并非一个简单不可分割的实体,而是一个复杂系统,其行为只能通过量子力学定律来理解。