采用随机整群抽样的方法，对深圳市宝安区松岗街道的学龄前儿童进行视力测查及影响因素调查。
Preschool students were selected by random cluster sampling from Songgang street of Bao an district in Shenzhen city.
松岗一次管理着约20个客户，他强调女性离开这个行业的原因是多种多样的，并且要具体问题具体分析。
Matsuoka, who manages about 20 clients at a time, stresses that the reasons women leave the industry widely vary and are case-by-case.
吉林南部杉松岗盆地早侏罗世植物群主要由松柏类、银杏类、真蕨类和茨康类组成，迄今已发现22属37种。
More than 37 species of 22 genera of fossil plants are recognized by the authors from the Shansonggang Basin of southern Jilin, China, including mainly conifers, ginkgoales, ferns and czekanowskiales.
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