When they're above one, they are growing rapidly.

当它们超过一个时，它们正在快速增长。

And if it's above one, then it continues to spread, the current estimate for COVID-19 is an R0 of 2.2.

若R0>1，则会继续扩大传播；当前，SARS-CoV-2的R0估计值为2.2。

Climb the stairs to the Capitol Building, where at the 13th step, you'll be exactly one mile above sea level.

不妨试试走楼梯到议会大楼 (Capitol Building)，因为走到第 13 级的时候，您刚好身在海面上一英里之处。

Guterres said the Pacific islands are especially at risk because much of their land is " just one to two meters above sea level."

古特雷斯表示，太平洋岛屿面临的风险尤其大，因为它们的大部分土地“仅高于海平面一到两米”。