round 和 around 和 surround 有什么区别？如果难以说明的话，请教我一下例句。

Round = spherical or circular in shape Example: Button mushrooms have round tops. Around = 1) continuously on every side of something, 2) navigate along the side of something, 3) approximately, or 4) in the area of. Examples: 1) The Himalayas lie around the Southwestern border of China. 2) Let's walk around this building. 3) I was around 9 years old when I first visited Berlin. 4) Let's walk around the park. Surround = to be all around something or to be encircling something. Example: The bandits surrounded our camp. Note: Some people will use the word "round" in place of the word "around," but this is technically incorrect and informal. In that case, the context will tell if the speaker means "round" or "around." I hope this helps! :)