Trap 是陷井的總稱 (bear trap, mouse trap…)
水管的彎折處把下水道的沼氣困在右邊，所以也被稱為是一種 trap
當動詞用時，連大氣層把熱困在地球週圍，都可以使用 trap 這個字
Snare 帶有繩圈或鐵圈的圈套，或者用網子的陷阱
a device that has a loop (called a noose) which gets smaller when the end of it is pulled and that is used to catch animals : a kind of trap 例如：a rabbit snare。這種陷井的特色是「有時會用誘餌，愈掙扎愈逃脫不了」
搭配的字常用「get caught in」，常見 snare 後面還會加 trap
當動詞時，snare 帶有一種誘騙的畫面（不像 trap 是一瞬間的畫面）
Entrap 思想上落入了陷井
to cause someone to do something that they would not usually do
使…陷入圈套；誘捕；誘騙
I firmly believe my son has been entrapped by this cult.
我堅信我兒子已經被這個邪教蠱惑了。
Ensnare 在制度上落入了陷井，且愈掙扎愈無法脫身
to catch or get control of something or someone
誘捕；使入圈套；使無法脫身
They wanted to make a formal complaint about their doctor, but ended up ensnared in the complexities of the legal system.
他們的初衷是對其醫生提出正式控訴，結果卻陷入了法律體系的繁複程序之中。