You could always make the tests more rigorous .

你总是可以让测试变得更严格。

It is a complete , rigorous piece of research .

这是一项完整而严谨的研究。

An obvious problem is that self-quantification experiments lack the rigorous controls and double-blinding of pharmaceutical trials .

一个很明显的问题是，自我量化实验缺乏严格的对照和药品的双盲测试。

Second , I don 't think there is a sufficiently rigorous approach to causality .

第二点，我不认为这里有足够严密的因果性。

Wow , I believe their participation will make this year 's competition even more interesting and rigorous .

哇，我相信他们的加入将会使今年的比赛更加的严酷和有趣。