MST

例句：

1. 1. The MST for this medication is 200mg per day.
   这种药物的最低有效剂量是每天200毫克。
2. 2. The MST for exposure to radiation has not been established yet.
   对辐射暴露的最低安全剂量尚未确定。
3. 3. The MST for the treatment of cancer is still being researched.
   治疗癌症的最低有效剂量仍在研究中。