他们的父母无可奈何地应允了这门亲事: their parents unwillingly consented to the marriage
点头: nod one's head; nod; nod assent; nod one's agreement; give permission 短语和例子对某人点头 (打招呼) nod at sb.; 她点头表示同意。 she gave a nod of assent. 那位女士冷淡地朝我点头。 the lady nodded drily to me. 对瞎马点头眨眼都是一样。