牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。When not removed, plaque causes tooth decay and gum disease.他们从上层文职部门清除了上千名公务员。They have purged thousands from the upper levels of the civil service.无法把所有的沙砾都清除干净。You'll never quite get rid of e...
socially acceptable behaviour合乎社会规范的行为They were socially uprooted and transplanted.他们成群结队地背井离乡,迁居他处.He believes that unemployment is socially divisive and is leading to the creation of an underclass.他认为失业会造成社会分化，道致贫困阶层的产...
A porcupine is covered with prickles.箭猪身上长满了刺.A little porcupine made a house by the side of the river.小刺猬在小河边上造了一幢小房子.One of the sharp hollow spines of a porcupine or hedgehog.豪猪或刺猬身上硬而中空的保护刺....