challenge virus造句

例句与造句

1. A three-year study by Dr . Harriet Robinson that involved 32 rhesus macaque monkeys indicates the vaccine prevents most monkeys from becoming sick after being repeatedly exposed to a " challenge virus, " a blend of HIV and SIV called SHIV . HIV does not reproduce or cause illness in monkeys, but SIV does.
2. It's difficult to find challenge virus in a sentence. 用challenge virus造句挺难的