The reason why some USB ports are black

原文摘要 · 中英对照

USB ports come in multiple colors, from eye-catching ones like orange and purple to plain old black ports. Here's what the latter signifies.

USB接口有多种颜色，从橙色、紫色等醒目的颜色到普通的黑色接口。以下说明后者代表什么。