Various additives are used to control density, setting time, strength and flow properties.

可用不同的添加剂去控制水泥的密度、凝固时间、强度和流动性能。

youdao

After three years, those in the exercise therapy group had maintained their bone density, unlike the small control group that was inactive.

FORBES: On The Cover/Top Stories

That enables control over interference, which in turns boosts range and device density.

ENGADGET: Qualcomm's FlashLinq long-range peer-to-peer communications tech demoed at MWC (video)

For example, if you eat when you are stressed, try to choose foods that are very low-calorie density like air popped popcorn or vegetables and hummus to keep calories under control.

CNN: Why do I always think about food?