illegal immigrant, person who enters a country illegally
不过真有偷渡客，我也不会太意外。
Still, I wouldn’t be too surprised if there really were some illegal immigrants.
我想这个人是个偷渡客，
I think this person is an illegal immigrant.
— 海上钢琴师 (1998)
听说有一批大陆偷渡客
I heard there’s a group of illegal immigrants from mainland China.
— 那些年，我们一起追的女孩 (2011)
“有偷渡客吗？”
Are there any stowaways?