Buying shares in blue-chip companies is always a sound investment.购买蓝筹股票总是稳健的投资。The car's reliability alone makes it a sound investment.单单这轿车的可靠性就能使它成为一笔很好的投资。Industrial expansion was a sound investment.产业扩张是一项可靠的投资。It was a financially sound investment.这项投资财务稳健。