直线 zhíxiàn straight line
straight line; sharply (rise or fall)
How to remember 直线: 直 straight + 线 line = straight line.
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How it is used
- A straight line in math - 两点之间直线最短 (liǎng diǎn zhījiān zhíxiàn zuì duǎn) the shortest path between two points is a straight line.
- Figuratively means a sharp, uninterrupted rise or fall: 销量直线上升 (xiāoliàng zhíxiàn shàngshēng) sales shot straight up.