2011年3月11日，旭川市，地震海啸发生后，那里的船只被潮水淹没。
Boats are swept by a wave after a tsunami and earthquake in Asahikawa city March 11, 2011.
2011年3月11日，旭川市，地震海啸发生后，那里的船只被潮水淹没。
Boats are swept by a wave after a tsunami and earthquake in Asahikawa city March 11 2011.
整群抽取武汉地区660名和日本旭川地区558名3岁儿童的母亲进行调查。
With cluster sampling, 660 mothers having 3-year-old child were investigated in Wuhan and 558 mothers in Japan with uniformed questionnaire.
整群抽取武汉地区660名和日本旭川地区558名3岁儿童的母亲进行调查。
With cluster sampling, 660 mothers having 3-year-old child were investigated in Wuhan and 558 mothers in Japan with uniformed questionnaire.
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