纸上得来终觉浅绝知此事要躬行——陆游这是第二节课。从学校办公楼三楼望下去,是内操场。30多名三年级的孩子在三名教师的带领下,来到内操场,简短集合后,孩子们分散到靠大楼的左边,三名孩子拿着手压冲气枪和自制卫星模型,以跑道为间隔一字排开,站在正前方的教师一声令下后,快速提压充气枪,随着一声“放射”的口 Feel the end of the paper felt that the matter must be practiced - Lu You This is the second lesson. Looking down from the third floor of the school office building, it is an inner playground. More than 30 third-grade children came to the playground under the leadership of three teachers. After a brief assembly, the children dispersed to the left of the building. Three children held a hand-held inflatable air gun and a homemade satellite model with runways spaced Lined up, standing in front of the teacher after an order, the rapid pressure inflation gun, with a sound “radiation ” mouth