下定决心

to make a firm resolution

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

to set / to fix / to determine / to decide / to order

to decide / to determine / to execute (sb) / (of a dam etc) to breach or burst / definitely / certainly

determination / resolution / determined / firm and resolute / to make up one's mind / CL:個|个[ge4]

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]