In this paper, the automatic level control system for four track concrete paver is researched.
本文对四履带滑模式水泥混凝土摊铺机自动找平控制系统进行了研究。
I had a four-track and a synthesizer then.
我有一个四轨录音机和合成器。
第四章田径。
GigBaby! Four track recorder, metronome, drum machine.
四轨录音机，节拍器，鼓机。
GigBaby! Four track recorder, metronome, drum machine.
四轨录音机，节拍器，鼓机。
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