“每日一词”
rock-a-bye
UK
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/ˈrɒk.əˌbaɪ/
US
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/ˈrɑːk.əˌbaɪ/
to rock a baby (= to move it backwards and forwards or from side to side in a regular way) to help it to sleep
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orc在英语-中文（简体）词典中的翻译
