1. But import competition is not a threat. ���ǽ��ھ�������һ����в��
2. We are today a Nation at risk to a new and changing threat. ���ǽ�����Σ�յĹ���һ���µĺͲ��ϱ仯����в��
3. Another threat to electricity supply comes from the power grid itself. ������Ӧ������һ����в�������ڵ���������
ӢӢ����
n.
1. something that is a source of danger
2. a warning that something unpleasant is imminent
3. declaration of an intention or a determination to inflict harm on another
4. a person who inspires fear or dread