最近journal of analytic toxicology

　　最近journal of analytical toxicology，专家给了一个这样的意见，专家意见：Plasma salbutamol concentrations were highest for withdraw at 12 h (0.3 ng/mL and 32.6 ng/mL before and after hydrolysis with β-glucuronidase/arylsulfatase, respectively), and were below the LOQ (0.2 ng/mL) for withdraw at 48 h in unhydrolyzed samples. Please provide the sampling time. 我现在对于Please provide the sampling time很疑惑，到底怎么修改？大家集思广益哈
===有问必答===

你投过Journal of Analytical Toxicology吗？感觉好中不？