英语语法分析

After treating for 4 weeks, the gastric emptying rate of rats was measured by radioisotopic technique.

用药4周后，用放射性核素法检测其胃的排空率。

Radioisotopic tracer technology measuring water entry profile has been used in oil fields for a long time.

放射性同位素示踪法测吸水剖面工艺在油田已应用很久了。