rough * out +
勾勒，畫出…的輪廓；草擬，擬出…的梗概
He’ll just rough out the whole picture and I can do the details. (他只要概略地畫出草圖，我就能把細節補上)
Professor Chen has roughed out a few basic ideas. (陳教授已勾勒出一些基本構想)
round * down +
捨棄尾數把 (數字、價格等) 調低或降低為整數
A charge of $10.11 will be rounded down to $10. (把 10.11 美元的費用下調為整數 10 美元)
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