1.infection 感染 Ear infections are common in pre-school children. 耳部感染在學前兒童中很常見e34iAWPtGpkF4qp。 2.multiply 增加 Such disputes multiplied in the eighteenth and nineteenth centuries. 這類糾紛在18和19世紀大量增多8.&b3S=(@|1u20。 3.fall back 回落 After a brief rally share fall back to a new low. 股票經過一次短暫回升后回落到一個新的低點fc=xMS3|frgVvG1^O.R。 4.perform 執行;完成 This operation has never been performed in this country. 這個國家從未做過這種手術3qU]9Q]CS2u*eql!,o。 Vw%X!R]8+T7