涂白剂

a white paint applied to tree trunks to protect the trees from insect damage etc

white / snowy / pure / bright / empty / blank / plain / clear / to make clear / in vain / gratuitous / free of charge / reactionary / anti-communist / funeral / to stare coldly / to write wrong character / to state / to explain / vernacular / spoken lines in opera

dose (medicine)

to apply (paint etc) / to smear / to daub / to blot out / to scribble / to scrawl / (literary) mud / street

surname Tu

variant of 途[tu2]