The plural 's' is not a free form, as it must always be attached to a noun.

表示复数的s不是自由语素，必须附着于名词。

《牛津词典》

It? S entirely Open Source, which means it? S free.

它完全是开源的，这意味着它是免费的。

youdao

Attaching hair extensions may sound eye - wateringly uncomfortable , but it ' s a pain - free procedure.

嫁接头发可能听起来十分不舒服，但却是完全无痛苦的做法。

youdao

The party also printed millions of pamphlets that warned against what it called "Cleveland's free trade policies."

VOA: special.2010.05.27

And it's always going to come down to calculating the appropriate free energy, and how it changes in the process.

这总是涉及到计算,适当的自由能，以及这些自由能在过程中如何变化。

麻省理工公开课 - 热力学与动力学课程节选

which is one of the few museums in D.C. that actually isn't free because it's not a national museum.

那是特区里少有的几个收费博物馆之一，因为它不是国家博物馆。

大都会艺术博物馆 - SpeakingMax英语口语达人

Still, Sun's VirtualBox is a promising entry into the desktop virtualization scene and its offer is compelling: It's free for personal use, and it's open source.

FORBES: Magazine Article

Mr. MIKE BELL (GM Employee): Everybody understands that GM needs to make more money, be more profitable, be competitive, and it's, you know, it's a free market and free trade now, so I mean it's stiff competition out there and there's so many different vehicles.

NPR: Lower Costs in UAW Contract Seen as Key for GM

But two things it's not: It's not always free (as in free beer), and it's not always easy.

FORBES: Magazine Article