Maps can guide us from a to b, show the structure of the landscape, display the changes in population distributions, or show future urban plans.
地图可以引导我们从A地到B地，显示景观的结构，显示人口分布的变化，或显示未来都市规划。
What are the main changes about this year's APASL hepatitis B Guide? Like switch other drug or IFN?
《国际肝病》：今年APASL乙肝指南的主要改变会是什么？是在更换药物还是使用干扰素方面？
Objective To evaluate the safety and efficacy of combined pneumatic and ultrasound lithotripsy in percutaneous nephrolithotomy(PCNL) for renal calculi under B-type ultrasound guide.
目的探讨B超引导建立穿刺通道经皮肾镜气压弹道联合超声碎石术（PCNL）治疗肾结石的疗效。
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