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be/get (oneself) into a jam:(使自己)身处困境或尴尬,英文的解释是:To force one's way into or through a limited space.。名词jam,我们比较熟悉的意思是“果酱”或“拥挤”(eg. a traffic jam),在这个句子中使用的是另一个含义“困境”(A trying situation; a predicament.)。