active front
(UK) Used in direct address to dukes, now chiefly in correspondence.
(physics, meteorology) The boundary between two different air masses, or a portion thereof, which produces appreciable cloudiness and precipitation and is usually accompanied by significant shifts in wind direction.
(chemistry) Any compound having the general formula R₃P=S <=> R₃P⁺S⁻.
Third-person singular simple present indicative form of stretch the envelope
気象学者たちは、活動性の前線が内陸に進むことで大雨と風向の変化をもたらすと警告した。
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