in·vad·er
noun/ɪnˈveɪdə(r)/
/ɪnˈveɪdər/
- an army or a country that enters another country by force in order to take control of it; a soldier fighting in such an army
武装入侵的军队（或国家）；侵略者 - a foreign invader
外国侵略者 - They prepared to repel the invaders.
他们准备赶走侵略军。 - (figurative) The white blood cells attack cells infected with an invader.
白细胞攻击受到感染的细胞。
- a foreign invader