1.129因为每两项之间的差数是3的n次幂
2.类似于掌上明珠吧（心肝宝贝 ）
源自《圣经·旧约·诗篇》第17章,"Keep me as the apple of the eye."（求你保护我,如同保护眼中的瞳孔.）另《申命记》第32章也出现"He kept him as the apple of his eye."（保护他如同保护眼中的瞳孔.）.现译作"掌上明珠",表示特别珍视的东西.
3.blackboard(黑板）?I'm not very sure...
4.couple夫妻
5.in the dictionary（字典里）