To fulfill one's duties conscientiously and to the best of one's ability; to discharge one's responsibilities diligently.
这位园艺师对花卉悉心照料，克尽厥职，使花园四季如春，生机盎然。
The gardener meticulously cares for the flowers, fulfilling their duties conscientiously, making the garden bloom like spring all year round, full of vitality.
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