span and tween的用法和样例：
- Span and Lucas hate Detroid, which ruined their garbage time.
- The optimal HLB was found to be 11.76 by evaluation of 10% butachlor EW, which was emulsified by the different HLB emulsifier consisted of Span 20 and Tween 20. According to the optimal HLB, different emulsifiers were studied.
- Addition of succinate buffer and Tween 80 facilitated CDH secretion.
- SPAN and TIMS are currently the most popular margin systems in the world.
- The section and reinforcements are adept for required span and loads.