e.g. fulfil one's contract / fulfil one's agreement / fulfil the clause of a contract / fulfil one's duty
implement - 具體貫徹、實行計劃、方針或某種行動，壹般涵蓋計劃步驟
e.g. implement an action / implement a plan / implement measures
practise - 偏向於形容行業、工業、業界中的某種普行為，用法也較為具體。
e.g.practise some industrial acts / practise quality controls on manufacturing / practise installing safety device
carry out - 與implement意思相近，壹般不涵蓋計劃步驟，但是如果形容貫徹計劃，可寫carry out one's plan。
e.g. carry out an action / carry out a plan / carry out one's duty