start by的用法和樣例：
例句
- The new conductor start by weed out the weaker player in the orchestra.
管弦樂隊新來的指揮一上任就先把較差的演奏人員清除出去了。 - You must start by unlearning all the bad habits your previous piano teacher taught you!
你得先改掉以前鋼琴老師教給你的一切壞習慣！ - The machine will start by itself in a few seconds.
機器在幾秒鐘後會自動開啟。 - I want to start by the11:30 from the northern station.
我想從北站坐11點30分的車走。
