self feedvt.自给(自行馈送；自动供料回授)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-levelling spreader自动水平调节吊具self- leveling material地面自流平材料self-directed hostility自我指向性敌意self-excited pulsed jet自激脉冲喷嘴self-addressed envelope回邮信封self sustaining discharge自续放电self-sustaining reactor自持堆self aligned schottky fet自对准肖特基栅场效应晶体管self-interest behaviors自私性self-thermal insulation自保温

1. The activities help children to develop a sense of their own worth.
   这些活动有助于儿童培养自身的价值感。