If you move or look backwards, you move or look in the direction that your back is facing.
The diver flipped over backwards into the water.
跳水运动员向后翻转跳入水中。
He took two steps backwards.
他往后退了两步。
If you do something backwards, you do it in the opposite way to the usual way.
He works backwards, building a house from the top downwards.
他倒着干活,从上往下盖房子。
You use backwards to indicate that something changes or develops in a way that is not an improvement, but is a return to old ideas or methods.
This country is going backwards.
这个国家正在倒退。
backwards and forwards
If someone or something moves backwards and forwards, they move repeatedly first in one direction and then in the opposite direction.
Using a gentle, sawing motion, draw the floss backwards and forwards between the teeth.
用轻柔的拉锯的动作把牙线在齿间来回拉动。