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

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.