名詞 start up:

1. the act of setting in operation
   同義詞：startup
2. the act of starting a new operation or practice
   同義詞：inauguration, startup

動詞 start up:

1. get going or set in motion
   同義詞：start
2. get off the ground
   同義詞：start, embark on, commence

1. The machine started up with a roar.
   機器一聲轟鳴開動了。
2. At six o'clock the motor started up.
   6點鐘時馬達開動起來。
3. The bus is starting up, Let's run to catch it.
   汽車剛開動，讓我們跑著趕上。
4. She's just started up a new company; I hope she makes a success of it.
   她新開辦了一家公司，我希望她取得成功。