How to say to feel about/to grope about/to fumble in Chinese 摸索

他把手伸进去，摸索出一串钥匙。 ( He reached in and fumbled out a bunch of keys. )

四周一片漆黑，部队只能在暗中摸索前进。 ( It was dark all around, and the troops could only fumble forward in the dark. )

在工作中已经摸索出一套行之有效的办法。 ( Have worked out a set of effective methods in the work. )

小偷在暗中摸索着，忽然触动了报警器。 ( The thief groped in secret and suddenly triggered the alarm. )

我们班在夜里摸索着前进 ( Our class groped forward at night )

摸索做人的道理 ( Groping for truth )

摸索出一些脱贫致富的路数。 ( Explore some ways to get rid of poverty and get rich. )

日不做，夜摸索。 ( Do not do day, groping at night. )