1) focused sampling
聚焦取样
2) focus sampling
焦点取样
3) accumulative sampling
聚集取样
4) sample focusing effect
试样聚焦效应
5) Focused microwave assist extraction
聚焦微波助萃取
6) direct focussing finder
直接聚焦取景器
补充资料:冲击波聚焦效应