这相比过去将长长的胃管导入患者消化道的旧式技术，无疑是一个巨大的进步。
It marks a vast improvement on an older technique that involves pushing a long tube through a patient's digestive tract.
阐述了化学导入法(PEG)、电穿孔法、注射法，粒子轰击法、花粉管萌导法及使用其它载体系统的成功实例。
The direct gene transfer systems involved the chemical method (PEG), electroporation, microinjection, particle bombardment, pollen-mediated gene transfer and other systems using various vectors.
目的研究氟离子导入过敏牙本质后牙本质小管的形态变化。
Objective to study the conditions and alterations of dentin tubule orifices after fluoride iontophoresis into hypersensitive dentin.
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