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かつて， かって， 嘗て， 曾て， 曽て， 都て

1. once, before, formerly, ever, former, ex- 2. never yet, never before, first time, still not happened

曾经，以前，前-；从未如此，从未有过，首次；还没有发生过

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意味をなす， 意味を成す， いみをなす

1. to make sense, to be meaningful

tbd

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ことがある， 事がある

1. (for something) to have occurred, to have done (something) 2. (for something) to happen on occasion

(某事)发生，已完成(某事)；(某事)偶尔发生

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はず， 筈， 弭

1. should (be), bound (to be), expected (to be), must (be) 2. nock (of a bow) 3. nock (of an arrow) 4. nock-shaped grip (between thumb and forefinger) 5. wooden frame on the tip of the mast of a Japanese ship that prevents the hawser from falling out...

应该（是），必须（是）

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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；表示与另一选项（无论是否明确提及）形成对比；表示强调

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