

布団にダニがいると、アレルギーの原因になります。
山を歩いた後は、ダニに刺されていないか確認してください。
掃除機をこまめにかければ、ダニはかなり減らせます。
"ダニ" is in the lesson "Insects" (Level 16), along with 21 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.