初次侵染(Primary infection)
植物在新的生长季节中受到从越冬(越夏)场所来的病原物的侵染称作初次侵染。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
Some viruses, with no attack phase, often damage the programs or disks they infect because they .
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