mixing formula的用法和樣例：
例句
- Fix the teat and bottle cap before mixing the formula in a bottle.
在奶瓶中混合配方奶前要先將奶嘴和瓶蓋固定好。 - Although it is very difficult to achieve with a formula as complex as this one, our blended herbs are maintained without preservatives or synthetic chemicals.
雖然要研製出如此複雜的複合配方確實不易，但我們不需加入防腐劑或化學物以維持其草本混合配方。
