It is the only carrier of a side chain primary amino group in proteins, having important structural and chemical roles.

它是一个侧链伯氨基的蛋白质，具有重要的结构和化学作用的唯一载体。

youdao

Some versions of the iPad can, for a monthly fee, use a 3G data connection like cellphones, but the only carrier mentioned was AT&T.

有一部分型号的ipad在每月付费的前提下像手机营养可以使用3G数据连接，但是苹果提到的运营商只有AT&T。

youdao

When I got the Droid in October of 2009, AT&T was the only carrier to have the 3GS, and rumors of the iPhone coming to Verizon were still just rumors.

当我2009年10月拥有了这台摩托罗拉Droid时，AT&T是3G网络的唯一运营商，那时候iPhone4S要进驻Verizon的消息也仅仅只是谣言。

youdao

GE-3 is virtually the only carrier for PBS's national network, which distributes programs to local public television outlets via the satellite.

CNN: graphic

Other than perhaps Southwest Airlines, JetBlue is the only carrier in the sky with a with a truly strong brand identity.

FORBES: Magazine Article

It should be noted that of the five companies surveyed, State Farm was the only carrier that consistently charged the good driver lower rates in all 12 cities.

FORBES: Why Safe Drivers Aren't Always Charged The Lowest Car Insurance Rates