when it comes to點用架?

When it comes to 可解作 " 當事件發生時 "

presntation時可以用作引子, 帶出主題.

舉例 -

1. When it comes to softdrinks, everyone knows about coca cola.
一講汽水, 人人知道 coca cola
2. When it comes to solutions to air pollution, petrol levy is only one of the many ways.
關於解決空氣污染, 汽油稅只是許多方法中的其一.
3. When it comes to losing weight, healthy diet & regular execise is the best method for long lasting result.
關於減肥, 健康的飲食習慣和經常運動是達到持久效果的最好方法.
4. When it comes to gaining money in the stock market, picking the good stock and patient are important.
要在股票市場賺錢, 選擇好股和耐性是重要的

冇乜特別意思或用法
意思是：當講到關於乜野時...

When it comes to environmental protection, self-awareness plays a crucial factor.
當講及環保，個人自覺是很重要的因素。