It should be black, or the color of field of study, unless it is for a doctor's degree in which case is may be gold.
流苏应为黑色或者是该学科的颜色，而博士学位的流苏可以是金黄色的。
Field is for the field of golden color, look, like a golden sea.
金黄色是给田野的，看，田野像金色的海洋。
Field is for the field of golden color, look, like a golden sea.
金黄色是给田野的，看，田野像金色的海洋。
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