✔ 最佳答案
im·mi·nent
–adjective
1.likely to occur at any moment; impending: Her death is imminent.
2.projecting or leaning forward; overhanging.
http://dictionary.reference.com/browse/imminent%20
so imminent concern means this concern is impending/about to happen, in other words, it also means this concern is of top priority, awaiting for you to be worried about now...