The testamentary trust fund was designated in the will for the children's education.

testamentary 是由名词 testament（遗嘱）加上后缀 -ary 构成的形容词，表示"与遗嘱有关的"或"根据遗嘱的"。 trust fund 是由 trust（信托）和 fund（基金）组成的复合名词，指"信托基金"，即由受托人管理的专门用于特定目的的资产。 testamentary trust fund 指"遗嘱信托基金"，即通过遗嘱设立的专门信托基金。