由于沙子对泵的磨蚀性很强，因此浓度不可过大。

Because of sand erosion on the pump strong, so the concentration can not be too large.

youdao

头部：强壮。头部大小应与总体外观协调，不可过大。

HEAD: Strong. In size balanced to general appearance, not too massive.

youdao

头部：强壮。头部大小应与总体外观协调，不可过大。

HEAD: Strong. In size balanced to general appearance, not too massive.

youdao