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試行錯誤， しこうさくご

1. trial and error

试错法、反复试验

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進歩， しんぽ

1. progress, advance, improvement, development

进步

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不可欠， ふかけつ

1. indispensable, essential

不可或缺的，至关重要的

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题

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に

1. at (place, time), in, on, during 2. to (direction, state), toward, into 3. for (purpose) 4. because of (reason), for, with 5. by, from 6. as (i.e. in the role of) 7. per, in, for, a (e.g. "once a month") 8. and, in addition to 9. if, although

tbd

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だ

1. be, is

断定助动词，是，是也

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