light upon
短语（偶然）发现
词形变化
lighting upon
lights upon
三单
lights upon
lit upon
lighting upon
现在分词
lit upon
过去式
lit upon
过去分词
lighted upon
过去式
lighted upon
过去分词
释义与例句
v.
-
1.
To find or think of something unexpectedly; to come upon something by accident.