surround

vt.

1. 围，围绕；圈住[H][（+with/by）]
   Trees surround our house.

   我们房子的四周都是树。

2. 使垂手可得，大量供给[H][（+with/by）]
3. 包围，围困
   The police surrounded the house.

   警察包围了这幢房子。