The scribbles on the walls ruined the neat appearance of the hall.

乱涂墙壁破坏了大厅的整洁外观。

Have a neat appearance and allow for easy trouble-shooting, maintenance and repair. See Fig. 6?

管路排列应有序、整齐，便于查找故障、保养和维修。如图6所示。

It is very necessary to make a cool and neat appearance of you whenever you go in front of that girl.

保持外表干净、帅气：不论是不是要去见心仪的女生，保持干净、帅气的外表对男生来说都是很重要的。

Hair should be trimmed short on tips of ears and may be trimmed on feet to give them a neat appearance.

耳朵上和足爪上的毛发可以适当剪短，可以使外观整洁、行动方便。