n.蛋白酶；蛋白酶類
A protease is key to the replication of the virus. 蛋白酶是阻止非典病毒變異的關鍵物質(zhì)。
The enzyme, known as a protease, is critical to replication. 這種稱作蛋白酶的酶對病毒復制至關重要。
