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   俄语
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пускать пробный шар强调
一般 put forth a feeler; put out feelers (Anglophile); put out a feeler (Anglophile); fly
具象的 fly a kite; test ('Might even have been on your land,' Grace said, testing.'I don't know exactly where it happened.' Abysslooker)
力学 send up a pilot balloon; send up a trial balloon
非正式的 try on
马卡罗夫 send out a feeler; throw out a feeler