无正方形着色的概念由阿龙在2002年引入图论。
The concept of square-free coloring was introduced in graph theory by Alon in 2002.
另一种常见的习俗是把草木灰洒在水缸旁边，因为人们认为这样可以引龙来布施雨水将其灌满（撒灰引龙）。
Spreading plant ashes around jugs was also common, as that would urge the dragon to fill them with rainwater.
引路和尾随的两头狮子，除各自作翻滚跳跃的动作外，还作些引龙和随龙“护驾”动作。
The two lions, which lead or follow the dragons respectively, will make some other actions besides the tossing and leaping.
阐述了引龙河农场水蚀沟的成因、危害及预防与治理措施。
This paper discusses the causation, damage and controlling and harnessing measure to the rain channel in Yinlonghe Farm.
阐述了引龙河农场水蚀沟的成因、危害及预防与治理措施。
This paper discusses the causation, damage and controlling and harnessing measure to the rain channel in Yinlonghe Farm.
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