practice makes perfect. 熟能生巧。
a young idler, an old beggar. 少壮不努力，老大徒伤悲。
a man becomes learned by asking questions.不耻下问才能有学问。
he that cli* high falls heavily.爬得越高，摔得越重。
from saving comes having.富有来自节约。
experience is the mother of wisdom.实践出真知。
don't teach your grandmother to suck eggs.休要班门弄斧。
don't trouble trouble until trouble troubles you.不要自寻烦恼。