因此，白垩孵化在春季和小群体中最常见。
Accordingly, chalkbrood is most common in spring and in small colonies.
风沙是河北省黄土丘陵区较常见的灾害性天气现象之一，多发生于冬春季节。
Wind erosion is one of the most calamity weather phenomenon in loess hilly-gully area of Hebei Province, it often occurs in winter or spring.
目的了解冬、春季节兰州地区因急性呼吸道感染住院的老年患者常见病毒感染状况。
Objective to study the common virus infection of elderly hospitalized patients admitted because of acute respiratory tract infections during winter and spring in Lanzhou district.
沙尘暴是我国北方地区春季常见的一种灾害性风沙天气现象。
The sandstorm is a kind of disastrous dusty wind weather phenomenon.
沙尘暴是我国北方地区春季常见的一种灾害性风沙天气现象。
The sandstorm is a kind of disastrous dusty wind weather phenomenon.
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