题目内容：

英语翻译
no sooner had some Native American leaders signed the Fort Laramie Treaty than settlers moved onto their lands.

优质解答

美洲印第安人一签署了《拉勒米堡条约》,殖民者便迫不及待地踏入了他们的领土.
"no sooner.than..."表示“一.就.”,
其用法是：no sooner+过去完成时.than+一般过去时
no sooner放在句首,后面内容要倒装,所以谓语had提放在了native American之前了