sinkhole

n. 阴沟的入口处,排水口,污水坑

sinewy, sinful, sinfully, sing, Singapore, singe, singer, singing, single, single out, single-minded, singlet, singsong, singular, singularity, singularly, sinister, sink, sink in, sinker, sinking, sinking fund, sinlessness, sinner, Sino- (also sino-), sinologist, sinology, sinuosity, sinuous, sinus, sinusitis, sip, siphon, sir, sire, siren, sirloin, sirocco, sirup, sisal,