我们每周都会清除一次电脑里的旧文件。Wǒmen měi zhōu dōu huì qīngchú yí cì diànnǎo lǐ de jiù wénjiàn.Every week we clear out the old files on the computer once.
墙上的旧漆得先清除干净,才能重新刷。Qiáng shàng de jiù qī děi xiān qīngchú gānjìng, cáinéng chóngxīn shuā.The old paint on the wall has to be scrubbed off completely before it can be repainted.