a known fact的相关资料：
临近单词
a meal
a
A second grenade was thrown.
a plant with variegated leaves
a perfect copy/fit/match
A father forgives his children
a ship standing to windward.
a highly infective organism.
a five-foot run of tubing.
a memorandum about the meeting
A Inequality of Matrices Trace
A Simple Introduce To Internet
