Taking the ecogeographical data into acount, the authors consider the surveyed area to be a natural focus of plague with the marmot M.baibacina as the main rservoir.

结合其它生态地理资料,判定沙湾县山地前山带鹿角湾存在鼠疫自然疫源地,并认为是以灰旱獭为主要贮存宿主的单宿主鼠疫疫源地。

's side, this opportunity cost can be charged up into acount in form of" financial cost", but on bargainee's side, sometimes it cannot be charged up into account.

在赊销信用双方中,商业信用的机会成本可以在供货方以“财务费用”的形式表现出来,但是由于会计的责权发生制原则,这种机会成本往往在购货方的财务处理上无法记录和体现。