以17对孪生婴儿作配对研究对象，35名幼儿园半寄宿生为分组研究对象。

In this study, we selected 17 pairs of twin infants and 35 half - time resident children in nursery school as our objects of study.

youdao

有一半的寄宿狗每天都来。

Half of the boarders come every day.

youdao

为减少成本，自2003年起洛川县320所小学和中学关闭了将近一半，致使700多名教师下岗，迫使更多的学生寄宿学校。

To cut costs, Luochuan has closed down nearly half of its 320 primary and middle schools since 2003, resulting in lay-offs for more than 700 teachers and forcing many more children to board.

youdao