difficult (to...) / problem / difficulty / difficult / not good
难
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又
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隹
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Mnemonic symbol: a video game which is almost impossible to beat.
难
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又
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隹
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Just inside the anthill's kitchen, Napoleon and a sparrow are trying to beat an insanely difficult video game. After playing and failing all day long Napoleon finally loses his temper and crashes the game wearing two boxing gloves.
万
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丆
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㇆
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As mnemonic symbol I choose a neuron, since each neuron is said to connect to 10000 others.
万
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丆
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㇆
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Willy Walrus needs to dig up the floor in the anthill's bathroom, but he is tired of doing so manually with a plough. To make his life easier, he sets up a wind wheel for electricity, connects a neuron to the wind wheel and the plough to transmit the electricity and uses his new DIY electric plough to dig much faster.