侵入途径：吸入、食入、眼睛、皮肤接触。
介绍了雷电等过电压侵入计算机（或电子设备）系统的途径，研究了如何防止由线路和地线进入的过电压。
The intrusion way of over-voltage like lightning into computer (electronic system) was intro- duced, and the protection methods against over-volt- age from circuits and ground were studied.
土壤动物的侵入与定居是矿区废弃地群落结构形成的重要途径。
The invasion and settlement of soil animals is an important pathway of the formation of soil animal community structure in abandoned mine land.
土壤动物的侵入与定居是矿区废弃地群落结构形成的重要途径。
The invasion and settlement of soil animals is an important pathway of the formation of soil animal community structure in abandoned mine land.
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