1. 制服
    A uniform is a special set of clothes which some people, for example soldiers or the police, wear to work in and which some children wear at school.

    e.g. The town police wear dark blue uniforms and flat caps...
           镇上的警察穿着深蓝色制服，戴着鸭舌帽。
    e.g. Philippe was in uniform, wearing a pistol holster on his belt...
           菲利普身着制服，腰带上别着手枪皮套。

2. （某一群体的）特种服式
    You can refer to the particular style of clothing which a group of people wear to show they belong to a group or a movement as their uniform.

    e.g. Mark's is the uniform of the young male traveller — green Army trousers, T-shirt and shirt.
           马克一身年轻男性旅行者的典型行头——绿军裤、T恤外加衬衫。

3. （同一物）始终如一的，均匀的，划一的
    If something is uniform, it does not vary, but is even and regular throughout.

    e.g. Chips should be cut into uniform size and thickness...
           土豆条要切得大小厚薄均匀。
    e.g. All flowing water, though it appears to be uniform, is actually divided into extensive inner surfaces, or layers, moving against one another...
           所有流动的水看似一成不变，但实际上内部分成许多广延的面，或者说层，彼此逆向移动。

4. （不同物）全都相同的，一律的，清一色的
    If you describe a number of things as uniform, you mean that they are all the same.

    e.g. Along each wall stretched uniform green metal filing cabinets...
           每面墙边都一溜摆着相同的绿色金属档案柜。
    e.g. Shrimp are raised in long uniform ponds, frozen in the nearby packing plant and shipped north.
           虾放养在清一色的长池子里，再送到附近的包装车间冷冻，最后用船运往北方。