单词：air column
air column的用法和样例：
例句
- The longer the pipe is, the longer the air column is, and consequently its inherent frequency and resonating frequency along with tone are low too.管子长，空气柱也长，其固有频率和与噪声共振的频率亦低，声调就低。
- Air flows from a reservoir up past leather-covered wooden pallets into pipes of various lengths, vibrating to produce different pitches.气流由储风槽通过以皮革包覆的木制调节瓣，进入长度不同的音管，振动空气柱发出不同的音高。
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