请问 just short of 在下面这个句子中是副词短语吗
疑问：of 和sending构成介宾关系吗?还是just short of作为一个固定的短语副词插入stop sending in the troops作状语,修饰stop sending in the troops
原句：This week,in the heart of civilized Europe,Slovaks and Hungarians stopped just short of sending in the troops in their contention over a dam on the Danube.