How can we avoid being kidnapped / hijacked by the aliens?
或：
What should we do to avoid being kidnapped / hijacked by the aliens?
注释：
avoid doing sth.避免做……
这里要用被动语态：avoid being done(避免被……)
我们怎么做才能不被外星人劫持 用英文怎么讲?
How can we avoid being kidnapped / hijacked by the aliens?
或：
What should we do to avoid being kidnapped / hijacked by the aliens?
注释：
avoid doing sth.避免做……
这里要用被动语态：avoid being done(避免被……)