中间放置不下一根头发，形容相距极微。 a seamless heavenly robe——flawless; by the skin of one's teeth; by a hair's breadth; the difference is as narrow as a hair's breadth;
律厤迭相治，其间不容发。——《大戴礼记》
比喻情势危急到极点。 the situation is extremely critical; within a hair of; within an inch of;
