This is because fifth generation networks are still in testing and trial phases.

这是因为第五代网络仍处于测试和试验阶段。

youdao

Some parts of the Open Platform have yet to be finalised, and the network was described as a "beta trial", a programming term for software ready for testing but not ready for final release.

开放式平台的某些部分尚未完成，而且该网络被描述为“测试版试用”，这是一个编程用词，表示软件可供测试，但并还未准备好最终版予以正式公布。

youdao

We perform many minor miracles through trial and error, excessive use of brute force, and lots and lots of testing, but--so often--it's not enough.

我们总是通过试错，过度的使用暴力（译者注：可能是指破坏程序结构的代码），大量的测试去完成一项工作；尽管很漂亮，但是常常是不够的。

youdao

A small community of design firms and regulators in North Carolina is currently testing the model, and after this trial period, it will be available free to the public on Bill Hunt's university faculty webpage.

VOA: standard.2010.08.04

Last year, Tanner was enrolled in a clinical trial testing the drug, called drisapersen.

WSJ: New Muscular Dystrophy Drugs Offer Hope

Then Wolchok put her in a trial testing ipilimumab with an experimental Medarex vaccine.

FORBES: Targeting Melanoma

Schering-Plough and Merck insist the ENHANCE study, though troubled, is only one trial testing their cholesterol drugs.

FORBES: Inside Schering And Merck's Secret Panel