That's thanks to all of those mutations on the receptor binding domain of the spike protein.
这是由于刺突蛋白受体结合域上发生的所有突变。
英语百科
Binding domain
A binding domain is a protein domain which binds to a specific atom or molecule, such as calcium or DNA. Upon binding, proteins may undergo a conformational change. Binding domains are essential for the function of many proteins.
Examples of binding domains include Zinc finger, which binds to DNA, and EF hand, which binds to calcium.