they could not even defend themselves (by) running swiftly like the horses .这里为什么要填by?怎么翻译

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they could not even defend themselves (by) running swiftly like the horses .这里为什么要填by?怎么翻译

by在这里做介词,表示所依靠的办法和所凭借的方式.
它们无法保护自己即使像马一样敏捷地奔跑.