And each had gone unrecognized until the advent of modern microbiological techniques, when the viruses could at least be isolated.

而且直到现代微生物学技术的出现方使每一种病毒得以确认，至此这些病毒已至少可被分离出来。

youdao

And each had gone unrecognized until the advent of modern microbiological techniques, when the viruses could at least be isolated.

而且直到现代微生物学技术的出现方使每一种病毒得以确认，至此这些病毒已至少可被分离出来。

youdao