例句：
Barons had to swear an oath of allegiance to the king.
贵族须宣誓效忠国王。
Many towns often found it politic to change their allegiance.
很多城镇经常发现改变拥戴对象才是上策。
The constitution requires members of parliament to take an oath of allegiance
宪法规定，议员必须宣誓效忠。
The police are the only civil servants who have to swear allegiance to the Crown
警察是唯一要宣誓效忠君主的公务员。
The allegiance of uncommitted voters will be crucial
未表态的选民支持谁将是至关重要的。