work on
對…起作用,對…發生影響,從事于…,致力于…
work on
v 1: to exert effort in order to do, make, or perform something;
"the child worked at the multiplication table until she
had it down cold" [syn: work at]
2: shape, form, or improve a material; "work stone into tools";
"process iron"; "work the metal" [syn: work, process]