Jǐnguǎn kùnnán chóngchóng, tā réng juéyì wánchéng zhè xiàng rènwù.
Despite numerous difficulties, she remained determined to complete the task.
Tips
usage
决意 implies a strong, firm resolution, often in the face of obstacles. It is slightly more formal than 决定 (to decide) and emphasizes the strength of will rather than just the act of deciding.