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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
boggle
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
English dictionary
Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
Translation
Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
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自动对光装置, 自动聚焦装置 - 双棱镜 - 转绘仪 - 定天镜, 定星镜 - 准直仪, 准直器, 平行光管, 瞄准仪 - 衍射光栅 - 均匀散射灯 - 取景器 - 光电调制器, 克尔盒, 克耳盒 - 受激辐射式光频放大器, 激光, 激光器, 镭射, 雷射 — laser- - 透鏡, 透镜, 镜头, 镜片 — linse, objektiv - Nicol prism (en) - planetarium (en) - polarimeter, polariscope (en) - 棱鏡, 棱镜 — prisme - projector (en) - Rochon prism, Wollaston prism (en) - stereoscope (en) - 觀察器, 观察器 — lysbildebetrakter[Spéc.]
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