screw-on cover 螺旋盖
Single cover retaining screw mounted on top of the indicator for easy access.
在流量指示器上安装一个盖子固定螺丝，便以打开进入。
Cover the bottom with pebbles. Screw on the lid. Decorate the lid, if you wish.
在罐底铺满小鹅卵石，凝上盖子。愿意的话，还可以装饰一下瓶子。
Put the absorbent cotton back into the tube, counterclockwise screw the tube on the cover tightly.
将吸透水的吸水棉放进套管内， 将套管逆时针方向旋紧在顶盖上。
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