underbelly

n [sing] 1 undersurface of an animal's body, eg as a cut of meat, esp pork（动物的）下腹部（如切下的一块, 尤指猪肉）. 2 (fig 比喻) area, region, etc that is vulnerable to attack 易受攻击的部位、 区域等: The stock-market crisis struck at the soft underbelly of the US economy, eg its trade deficit. 股市危机打击了美国经济的薄弱环节（如贸易逆差）.

undefined, undemanding, undemonstrative, undeniable, undeniably, under, under arms, under control, under the charge of, under the heel of, under the order of, under way, under-, under-secretary, under-sexed, under-side, underachieve, underachiever, underact, underarm, underbid, underbrush, undercarriage, undercharge, underclothes, undercoat, undercover, undercurrent, undercut, underdeveloped, underdog, underdone, underestimate, underexpose, underexposure, underfed, underfelt, underfloor, underfoot, undergarment,