1. Take as many as you need, but use them sparingly. 需要多少就拿多少，但是用的时候不要浪费。
2. Apply flux to outside of tube and inside of solder cup. Surfaces to be joined must be completely covered. Use flux sparingly. 在管道外面和焊接端口内侧涂上焊剂。需要连接的表面必须完全覆盖焊剂。要节约使用焊剂。
3. In my view, this is the single Golden Rule in dealing with the rich: time is the one thing they can't buy more of. Use it sparingly. 在我看来，这是和富人打交道的唯一黄金法则：富人什么都能拿钱买，只有时间买不来。所以在占用他们时间的问题上要力求节省。
