A swarthy boy opened a book and propped it nimbly under the breastwork of his satchel.
一个面
黧黑的少年打开书本，麻利地将它支在书包这座胸墙底下。
地;妙地;A swarthy boy opened a book and propped it nimbly under the breastwork of his satchel.
一个面黧黑的少年打开书本，麻利地将它支在书包这座胸墙底下。
Already the component standardizes and is seriated since being applied or used universally may deploy according to needing nimbly can shorten designing and making a period.
由于通用部件已经标准化和系列化，可根据需要
，能缩短设计和制造周期。
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