He knew his lesson Backwards and forwards.
他彻底了解他的功课。
He took up the knife and drew it backwards and forwards over his throat.
他便拿起刀，在他的喉咙前面划来划去。
Focus on the dot in the center and move your head backwards and forwards.
将视线集中在中心的小黑点，然后前后移动你的头部，你发现了什么？
She's only in nursery school and she can spell her name backwards and forwards.
她只是在托儿所上学，就可以把自己的名字正着反着拼。
She's only in nursery school and she can spell her name backwards and forwards.
她只是在托儿所上学，就可以把自己的名字正着拼反着拼。
The battle has been moving backwards and forwards all afternoon and into the evening.
整个下午，战斗的形势一直是不断逆转，这种形势一直持续到晚上。
Sometimes they seem to move backwards for a time and then forwards again.
它们时而往前时而向后。
Sometimes they seem to move backwards for a time and then forwards again.
它们时而往前时而向后。
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