直到1945年，日本从未受到过外敌入侵。
中国的长城是一个非常长的人造城墙为了防止外敌入侵。
The Great wall of China is an immensely long man-made wall that was built to keep out invaders.
当面临外敌入侵时：法兰西国王查理八世在1494年5月的入侵。
theinvasion of the foreigner came: that of King Charles VIII of France in 1494–5.
一旦有“外敌”入侵，这些蛋白质就会发出信号，调集白血球进行防御。
Once a "foreign" invasion, these proteins will send a signal to the mobilization of white blood cell defense.
一旦有“外敌”入侵，这些蛋白质就会发出信号，调集白血球进行防御。
Once a "foreign" invasion, these proteins will send a signal to the mobilization of white blood cell defense.
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