The hope is that you can find a tip type that feels comfortable for long hours and still seals your ear.

这样设计的目的是希望你能找到能封住耳朵，而且戴很长时间耳朵也不会痛的耳塞。

youdao

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Work on this "prototype" allowed him to figure out technique, layout and technical details like the type of paper (19-by-13-inch watercolor) and writing instruments (felt-tip pens).

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