井盖 

Pinyin: jǐng gài 
Meaning：Well lid   
Sentence：有时井盖可致使人陷入危险境地。Sometimes the well lid can trap people into dangerous situations. 

More: 

井： 

Pinyin: jǐn
Meaning: Well; warn
Radical: 二
Stokes: 4
Traditional: 井
Common words/Phrase:
井喷 [jǐng pēn] 【blowout】 
井口 [jǐng kǒu] 【the mouth of a well】
井底之蛙 [jǐng dǐ zhī wā] 【be a person with a very limited outlook】
井井有条 [jǐng jǐng yǒu tiáo] 【be in prefect order】
井架 [jǐng jià] 【derrick】

盖： 

Pinyin: gài,gě
Meaning: Lid
Radical: 皿
Stokes: 11
Traditional: 蓋
Common words/Phrase:
盖章 [gài zhāng] 【to affix a seal】 
盖子 [gài zi] 【lid】
盖板 [gài bǎn] 【cover board】
盖世 [gài shì] 【matchless】
盖饭 [gài fàn] 【rice with meat and vegetables】