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如果你要做一把椅子,一定需要一些木头和钉子,那你会因此去种树、去打造铁钉吗?不要做那些无用功,商店里早已为你备齐了。
If you need to be a chair, you will need some wood and nails, then you will plant trees and build nails? Do not do those useless work, and the shops are ready for you.