线下的英文：
below-the-line

参考例句：

Subscript: Small character printed below the base line as part of mathematic equation. Also called Inferior character.
下标字符:在数学公式内，放在基线下的细字。

Chicks reared under natural light are frequently debeaked at 1 day of age or a few days after delivery to the brooder
在天然光线下饲养的小鸡，经常是在一日龄时或在进入育雏室后几天内断喙。

Write your name below the line.
在线下写上你的名字。

Off-line business operation
线下商贸运作

A ship disappeared below the horizon.
一艘轮船消失在地平线下。

It was even more pleasing to look at in the morning light.
它在早晨的光线下看起来更悦目。

Reading in a poor light taxes the eyes.
在暗淡的光线下读书很累眼睛。

Reading in a dim light is bad for the eyes.
在暗淡的光线下看书有损视力。

To read in the glaring light hurts one's eyes.
在耀眼的光线下看书伤眼睛。

The same hue will look different in different light.
同一颜色在不同的光线下看起来会有所不同。

line是什么意思：
n. 线条，界线，路线；条纹；排；铁路线；生产线；台词；态度；防线；前线
v. 用线标出，划线于；使布满纹络；加衬里于；排队，排列成行

This is a lined trunk.
这是一个有衬里的箱子。

They are politically in line.
他们在政治上意见一致。

On a map there are horizontal lines and vertical lines.
在地图上有水平的线和垂直的线。

To inscribe(a line or lines)with a pencil or other marking implement.
画用铅笔或其它做标记的器具刻线

The new proposal is in line with our general line.
新建议和我们总的原则是一致的。