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一斉に， いっせいに

1. simultaneously, all at once, in unison

同时，齐声

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旗を振る， はたをふる

1. to wave a flag 2. to show the way

tbd

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彼ら， 彼等， かれら

1. they, them

tbd

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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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