单语范例（未经PONS编辑处理）
They are considered to be indispensable to preparing their members for the goal of faith.
en.wikipedia.org A good guide is indispensable, and many guides occasionally refer to a map.
en.wikipedia.org First of all, the steering mechanism is indispensable factor.
en.wikipedia.org His vocal and instrumental music for court ballets gradually made him indispensable.
en.wikipedia.org Although initial passenger numbers were low and their service area remains limited to the inner city, these systems have become indispensable to many commuters.
en.wikipedia.org