例句與造句

1. Investigation on accumulation level of pcbs in parturients and infants in somewhere of south china
   南方某地產(chǎn)婦和嬰兒體內(nèi)多氯聯(lián)苯蓄積水平的調(diào)查
2. It's difficult to find accumulation level in a sentence. 用accumulation level造句挺難的