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探測気球 (たんそくききゅう) — sounding balloon; sonde
探測気球
sounding balloon
探す さがす
to search for; to look for; to hunt for; to seek
球 「きゅう」「たま」「まり」
ball (for sport, games, etc.)
予測 よそく
prediction; estimation
探偵 たんてい
detective; investigator; sleuth
観測 かんそく
observation; survey; measurement