使用一次藥劑防治難于持久地控制害蟲(chóng).Rarely can permanent control be achieved by a single application of spray.五是穩(wěn)定持久地加強(qiáng)基礎(chǔ)研究.Fifth, strengthening basic research in a steady and sustained way.每個(gè)企業(yè)努力持久地與顧客保持合作關(guān)系.Every business strives to hav...