可以用 "They are satisfied with it." 来表示 "他们对此很满意"。
这是一个英语常用的固定搭配，satisfied 是形容词，表示 "满意的"。例如：
The customer was satisfied with the service. (顾客对服务很满意。)
I'm satisfied with my grades this semester. (我对这个学期的成绩很满意。)
也可以用 "They are pleased with it." 来表示 "他们对此很满意"，pleased 是形容词，表示 "满意的、高兴的"。例如：
The teacher was pleased with the students' progress. (老师对学生的进步很满意。)
My parents were pleased with my decision to go to college. (我的父母对我上大学的决定很满意。)
这是一个英语常用的固定搭配，satisfied 是形容词，表示 "满意的"。例如：
The customer was satisfied with the service. (顾客对服务很满意。)
I'm satisfied with my grades this semester. (我对这个学期的成绩很满意。)
也可以用 "They are pleased with it." 来表示 "他们对此很满意"，pleased 是形容词，表示 "满意的、高兴的"。例如：
The teacher was pleased with the students' progress. (老师对学生的进步很满意。)
My parents were pleased with my decision to go to college. (我的父母对我上大学的决定很满意。)