spotting
名词 spotting:
the act of spotting or staining something
同义词:staining, maculation
the act of detecting something; catching sight of something
同义词:detection, catching, espial, spying
动词 spot:
catch sight of
mar or impair with a flaw
make a spot or mark onto
become spotted
同义词:spot
mark with a spot or spots so as to allow easy recognition
同义词:spot