He got a large fortune when his father died, but trifled it away in only a few years of needless spending.
父亲去世时他得到一大笔财产, 可仅仅几年的时间就将这笔钱胡乱挥霍一空。
needless to say, learning without thinking is useless.
不用说, 学而不思则罔。
needless to say, he kept his promise.
不用说, 他信守了他的诺言。