Greyboard (hard board for the cover).
硬卡纸(用作封面)。
The teacher tried hard to interest the little girl in English, but he went by the board.
老师努力想使这个小女孩对英语产生兴趣，但他的努力落空了。
They worked hard, but got only board wages.
他们工作辛辛苦苦，但所得的报酬仅是膳宿而已。
When his family fell on hard times, he was offered free room and board.
当他的家陷入困境时，他被提供免费食宿。
When his family fell on hard times, he was offered free room and board.
当他的家陷入困境时，他被提供免费食宿。
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