adj.向后的，倒行的，返回的，落后的
adv.向后，往后，倒，逆
The third wave was so strong it knocked me backwards.
第3波浪太大了，把我打了回去。
He works backwards, building a house from the top downwards.
他把工序倒过来了，从上往下建房子。
Draw the floss backwards and forwards between the teeth.
将牙线在齿间来回拉动。
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