我记不太清楚。大约四次。

I don't remember exactly. About four times.

youdao

研究者对每份样品进行大约四次测序，然后结合不同人的测序结果比较遗传变异。

The researchers sequenced each sample approximately four times, and then combined the data with that of different people to compare genetic variations.

youdao

捷豹可以在一秒内进行230万的四次方的数学运算，比一般的笔记本电脑运算速度快大约10万倍。

Jaguar is capable of 2.3 quadrillion mathematical operations every second (which is about 100, 000 times faster than a typical laptop).

youdao