U.S. aid的用法和样例：
例句
- Hope for United States aid played a great part in the jockeying between contending factions.
争取获得美援的希望，大大促进了各派系的相互倾轧。 - Too many underdeveloped nations self-righteously insist that receiving American aid is their God-given right rather than a manifestation of American generosity.
太多落后国家理直气壮地坚认接受美援是天赐权利，而非美国乐善好施的表现。
