In this complex, fluid environment, providing an appropriate measure of oversight and control can be a major challenge.
在这个复杂的变换的环境当中，提供一个合适的方法来控制和监督将是一个主要挑战。
Allantoic fluid of chicken embryo that had been inoculated with one strain of renal type IBV was used to challenge 16-day-old chicken.
用鸡肾型传支病毒（IBV）分离株的鸡胚尿囊液接种16日龄蛋雏鸡，并随机分为对照组、中药治疗组和卵抗治疗组。
Objective to study the association of composition in plaque fluid after sugar challenge wi th caries susceptibility in order to find predictors of identifying individual caries risk.
目的研究糖代谢后牙菌斑液化学成分与龋的关系，探求判别个体龋易感性中的因子。
Objective to study the association of composition in plaque fluid after sugar challenge wi th caries susceptibility in order to find predictors of identifying individual caries risk.
目的研究糖代谢后牙菌斑液化学成分与龋的关系，探求判别个体龋易感性中的因子。
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