B: Those that vary from time to time, like the consumables, material costs, etc.

B：那些随时间改变的成本，比如易耗品及材料成本等等。

youdao

A: I would suggest that you use this material instead of that. B: But that costs more. A: But you will get less waste from this. B: We'll try it once. A.

我建议你改用这种替代那种。B：可是那样成本较高。A：但可以减少浪费。B：那么就试一次看看吧。

youdao