Plate conveyor head round the main device, the chain plate scale devices, the end of round tensioning device, rack and drive components.

板式输送机主要由头轮装置、鳞板链条装置、尾轮张紧装置、机架和驱动装置组成（略）。

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I whisked round and had just time to catch a glimpse of something which I took to be a large black calf passing at the head of the drive.

我猛然转过身去，刚刚来得及看到一个象大牛犊似的黑东西飞快地跑了过去。

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