低档的英文：
underdrive

A blanket fabric made of low-grade woolen cloth with a nap on both sides.
粗厚起绒呢料用低档羊毛布料制成的，两侧有绒毛的制毯织物。

Low end
低端,低档

Output shaft low gear
低档轮出轴

a synthetic fabric.An ersatz product is a transparently inferior imitation
合成纤维。产品是一种明显的低档仿制品

One place where the Internet's TCP/IP network protocol definitely wins over other brands of networks is at the low end.
Internet的TCP/IP网络协议胜过其他类型的网络的优势之一是它适合于低档终端。

All you need in order to set up a TCP/IP connection is the lowly serial port your PC already has.
建立TCP/IP连接所需要的只是PC机已具备低档串行端口.