“投机的”的英语？

土地投机的浪潮到1981年结束.The boom in land speculation came to an end in 1981.所有生产和投机的复杂情况都不考虑.All the complications of production and speculation are eliminated.大胆的冒险者,有时也许由于两三次投机的成功而获得很大一笔财产.A bold adventurer may sometimes acqui...