selfn.自己；本性；自我pron.我自己；你自己；他或她自己adj.始终如一的；同一类型的；性质不变的v.近亲繁殖；自花授粉self blowingadj.自吹的

1. Pendulum clocks showed the hours more exactly than earlier clocks, since the weight on the pendulum could be moved up or down to make the clock to go faster or slower.
   摆钟比早期的钟记时准，因为摆上的重锤可以上下移动调整钟的快慢。