这些黑人还挥舞着铁锹往炉膛里添煤，哼着小曲，细杆哈查德就曾在阿尔及尔渡口当过水手。
The same Negroes plied the shovel and sang. Old Big Slim Hazard had once worked on the Algiers ferry as a deckhand.
他冲儿子哼着小曲。
我有许多学习朋友一边弹着吉他、哼着小曲，一边学习英语！
I have lots of friends who learned English while strumming a guitar and humming at the same time!
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