我们每次要学十几样新的技能，比如学习物体的名称。同样的练习我们做了一遍又一遍。
We work on about a dozen new skills at a time, such as learning the names of objects, and we repeat the exercises over and over, and over again.
国际先生评估项目每三年举行一次，次要目的是评估15岁的先生能否曾经获得参与社会所需的知识和技能。
PISA, which is held every three years, primarily aims to assess whether 15-year-old students have acquired the knowledge and skills required to participate in society.
国际先生评估项目每三年举行一次，次要目的是评估15岁的先生能否曾经获得参与社会所需的知识和技能。
PISA, which is held every three years, primarily aims to assess whether 15-year-old students have acquired the knowledge and skills required to participate in society.
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