You must keep repeating the lines until they are known by heart.
你必须反复朗读这几行，一直到能背诵为止。
That light travels in straight lines is known to all.
众所周知，光沿直线传播。
It is well known that light travels in straight lines.
众所周至，光以直线传播。—— 主语从句。
It is known to all that light travels in straight lines.
光沿直线传播，这是众所周知的事。
That light travels in straight lines is known to all.
众所周知，光线沿直线运行。
Inter - line space (Interlinear space) : space between lines in text. Better known as Leading.
行间距：内文字行间的空位，亦称行隔。
Inter - line space (Interlinear space) : space between lines in text. Better known as Leading.
行间距：内文字行间的空位，亦称行隔。
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