There are obviously several aspects to GWT that helps avoid leaks and such but this does not mean that any third party code written in GWT is 100% leak free.

当然GWT从几个方面可以帮助避免泄露，但是这并不意味着用GWT编写的第三方代码就100%不会泄露。

youdao

Its good water tightness makes it leak free. Good mechanical performance enables the ceiling to cushion exterior impact and bear a weight as much as 100kg.

由于其良好的机械性能使天花能减缓外力冲击，承载100公斤以上的重量。

youdao

A common misconception that users have is that any third-party library written in GWT magically runs fast, is completely leak free, and renders perfectly on all browsers.

用户有一个常见的误解：任何用GWT编写的第三方库都会如魔法般快速运行，它们是完全无泄漏的，而且在所有浏览器上都能完美展现。

youdao

What is certain is that only a few Romney hands know the details of the vice presidential selection process, making this year's iteration of the "veepstakes" -- a quadrennial feeding-frenzy of gossip and often ill-informed speculation -- one of the most secretive and leak-free endeavors in recent memory.

CNN: Romney risks playing running mate hand too early

The arrangement let Casey conduct his most secret work largely free from the risk that details would leak.

CENTERFORSECURITYPOLICY: Center for Security Policy | CIA Director William Casey: His Analysis And Plain Speech Help Him Lead The Agency to the Top

In the fall of 2005, editors enjoyed a free hand to report on a catastrophic chemical leak in the Songhua River.

NEWYORKER: The Forbidden Zone