Dìngqī qīngxǐ chuángdān kěyǐ jiǎnshǎo fěnchén mǎn de shùliàng.
Washing bedsheets regularly can reduce the number of dust mites.
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粉尘 ('dust', literally 'powder-dust') + 螨 ('mite'). A calque of 'dust mite'. Paired with its close relative 屋尘螨 (Dermatophagoides pteronyssinus, European house dust mite) in allergy test panels.