sim  
noun [ C ] uk/sɪm/ us/sɪm/
  (COMPUTER GAME)      
  informal模拟型电子游戏 
a type of computer game that is designed to simulate (= represent) real conditions or an aspect of real life
  This dating sim was the hit game of the year. 这个模拟约会游戏是今年的热门游戏。 
 an incredibly realistic flight sim 一个非常逼真的模拟飞行电子游戏 
 - More examples
 - They were practising with a goalkeeping sim.
 - What is the best value-for-money tennis sim around?
 - This is as realistic a combat sim as you could ever hope for.
 - This is still the best game around for serious sim pilots.
 
  (IN PHONE)      
 (also SIM)手机SIM卡 
a  SIM card 
  First, you will need to activate your sim. 首先,你需要激活SIM卡。 
 You can easily transfer numbers onto your new SIM.
 - More examples
 - You will have to buy a new phone and a new sim as well.
 - Save money on overseas mobile usage by buying a different sim for when you are travelling.
 - The user can change operators while retaining the handset simply by changing the SIM.