in the same time,at the same time,on the same time,for the s

in the same time是指在 “一样的时间”
at the same time是指 “同时,然而” ,可表转折.
on the same time是指“在同一时间”
in the same time 指某个时间段,比如8：00～12：00.
at the same time 指准确的时间 8：00就是8：00 一分也不多也不少.
On the same time,China have important markets in EU,USA and Japan,requirement of traceability of sea foods in these country become more and more evidence.
同时,我国也是水产品贸易大国,在欧盟、美国、日本等国都有一定的市场份额,这些国家逐步开始要求出口到本国的产品具有可追溯性.