1. When you are doing mental math, by quickly saying the first digit of a math problem, it gives the illusion that you've computed the entire answer immediately.2. His family seems happy and united, but it's all a charade. They fight all the time.3. A spacious receptionist area will create the impression that we are a large corporation.
 illusion impression charadecharade 指外表看起來是一回事，事實上是另一回事，illusion 跟 impression 都能用來指假象或想營造的印象，如例句。
他們家人看起來快樂親密, 事實上不過是假象罷了, 他們常常吵架.