瞄准 

Pinyin: miáo zhǔn 
Meaning：
Sentence: 仔细瞄准后再射击。Aim carefully before shooting.

More: 

瞄：

Pinyin: miáo
Meaning: To aim
Radical: 目
Stokes: 13
Traditional: 瞄
Common words/Phrase:
扫瞄[sǎo miáo] 【scan】 
瞄上[hú lu sī] 【take a fancy to】

准： 

Pinyin: zhǔn
Meaning: Standard, to allow
Radical: 冫
Stokes: 10
Traditional: 準
Common words/Phrase:
准备[zhǔn bèi] 【prepare】 
准确[zhǔn què] 【precise】
准时[zhǔn shí] 【on time】
准则[zhǔn zé] 【norm】
准许[zhǔn xǔ] 【allow】