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やあ

1. yo!, hello there!, hi! 2. wow!, oh!, ah! 3. yah! (yell)

tbd

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ずいぶん， 随分， ずい分， 隨分

1. very, extremely, surprisingly, fairly, quite, considerably, awfully, terribly 2. terrible, horrid, contemptible, reprehensible 3. remarkable, extraordinary

非常，极其，出乎意料地，相当；可怕的，可憎的，卑鄙的，应受谴责的；非凡的

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久しぶり， 久し振り， ひさしぶり

1. a long time (since the last time), first in a long time

tbd

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だ

1. be, is

断定助动词，是，是也

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