The kids are try to compact the sand into the mold.
孩子们正在设法把这沙土堆积到模子里。
The mold had small and compact structure and could operate smoothly.
该模具结构小巧而紧凑，运行顺畅无阻。
With the originally imported mold used for impact molding, the lock body has the following features: compact structure, good mechanical linkage, and smooth opening.
锁体采用原版进口模具冲压成型：结构紧凑、机械联动性好，开启畅顺。
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