With few animal tests and (virtually no human testing), there's been next to no scientific analysis of the issue.

这方面所开展的动物试验寥寥无几(人体试验更是没有)，所以关于这个课题基本没有任何科学分析。

youdao

The purpose of the early human testing was not to study positive results form Peptide 7, but to look for any harmful side effects.

早期人体试验的目的，不是研究缩氨酸7号的积极效果，而是探索有无有害的副作用。

youdao

In general, it's difficult for scientists to pinpoint the exact causes of human myopia, and therefore its cure, since human testing usually isn't possible.

一般情况下，科学家们很难找到人类近视的确切原因，因而很难发现治愈方法，而且人体试验通常不太可能实现。

youdao

The WHO authorized drug manufacturers to begin testing possible vaccines, and the first human trials began a month later.

VOA: standard.2009.12.25

and improve the quality of human life to the extent possible without using animal testing.

以及提高人类的生活质量。

需要动物实验吗？ - SpeakingMax英语口语达人

The practice includes developing and testing new vaccines and drugs that might prevent or cure potentially-fatal human diseases.

VOA: standard.2010.02.16

By 1998, the drug, then known as PS-341, had advanced into early-stage human testing.

FORBES: Magazine Article

Pfizer has begun human testing of a pill that stimulates growth-hormone release in the body.

FORBES: Sweet syringe of youth

Fifty-seven new compounds are in human testing, triple the size of its disclosed pipeline in 2002.

FORBES: Magazine Article