非侵染性病害是由不适宜的环境因素持续作用引起的,不具有传染性。
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The 15th day in Zhengyue is the first occasion in the year to__________________.
Since ancient times,eating_______________has been a tradition at this festival.
Both “Yuanxiao” and “Tangyuan”sound familiar with “Tuanyuan”,sybolize _________.
The Chinese nation values the dragon, and considers it as________ .