And it's this rapid-fire mutation that makes whipping up a vaccine for this set of viruses a pretty tall order.

正是快速突变使得为防御病毒打疫苗成为了个要求。

Most of these gene mutations are deletions or duplications of one or more exons, and a small amount are point mutations.

基因突变大多数为个或多个外显子缺失或重复，小分是点突变。

The incidence of HER2 mutations ranges from 2% to 4%.

HER2突变发生率为2%至4%。

This abrupt shift to an " intensive mothering narrative" , which suggests that mothers should manage child care alone, was likely to have been harmful.

突变为“密集型母亲叙事”，它暗示母亲应该独自管理儿童护理，可能是有害。

For example, analysing the genes of a weaponized pathogen as it spreads could give us clues as to where it came from, based on the mutations it develops.

例如，分析武器化病原体在传播过程中基因，可以根据它产生突变，为我们提供它来自何处线索。