The randomised control trial involved hundreds of year 5 pupils—aged nine and ten—at 45 state primary schools that had not been "previously exposed to RSC pedagogy".
这项随机对照试验涉及45所未' previously exposed to RSC pedagogy '（此前未接触过RSC教学法）的公立小学中数百名五年级学生，这些学生年龄为九到十岁。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。