例句與造句

1. While most fluoride varnishes contain 5 % sodium fluoride at least one brand of fluoride varnish contains 1 % difluorsilane in a polyurethane base in a shellac base.
2. With the exception of diamonds a coolant is constantly applied to keep the gemstone cool since it is usually held in place on the end of a dop using high temperature shellac based wax, paint or other adhesive . ( The dop in this case is a machined brass or stainless steel rod)
3. It's difficult to find shellac base in a sentence. 用shellac base造句挺難的