四级作文笔记
. 方便:convenient/ convenience
2. 效率:efficient/ efficiently/ efficiency
3. 节省和浪费:save time/ money/ space; economical, thrift
waste time/ money/ space; costly, lavish
4. 人的心理健康:independent, cooperative, competitive,
considerate, confident, creative, sociable,
perseverance; selfish, isolated, conserative