The rate of spread of a virus would therefore be limited by how quickly it could replicate in each cell.

因此，它在每个细胞中复制的速度会限制病毒传播的速度。

youdao

Days after Mexico suspended public activities virus,testing it, flu, to reduce the spread of swine flu, the country is reporting a leveling off in the rate of new infections.

VOA: standard.2009.05.03

His strategy is unusual among cancer researchers, who have tended to focus on identifying cancer-causing genes rather than writing differential equations to describe the rate of tumor spread.

FORBES: Ideas & Opinions

But given the size of those reserves, and the banks overwhelming need for income, it might not take much in the way of interest rate spread expansion to get some monetary inflation of the double digit variety from these banks.

FORBES: Monetary Watch June 2011, Inflation prospects post QE II

But such investments have been earning the benchmark rate minus some spread of late.

FORBES: Written by By Drew Hofler