英语词汇principal sign怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

1
The second chapter will focus on the background of the rising of the new African American middle class and its principal sign.
第二章重点论述了新黑人中产阶级的崛起标志和背景。
2
When I reached the office, the school secretary ushered me in to see the principal without making me wait-not exactly a good sign.
我到达办公室时，校长秘书向我迎来，没有让我等，而是直接叫我去见校长——这可不是个好兆头。
3
Both the Principal Cardholder and Supplementary Cardholder are required to sign this application form.
信用卡主卡客户及附属卡客户须同时签署本申请表。

单词	principal sign
释义	principal sign 简明释义主征：指在医学诊断中，对某种疾病或症状的判断和诊断的重要依据。双语例句 1 The second chapter will focus on the background of the rising of the new African American middle class and its principal sign. 第二章重点论述了新黑人中产阶级的崛起标志和背景。 2 When I reached the office, the school secretary ushered me in to see the principal without making me wait-not exactly a good sign. 我到达办公室时，校长秘书向我迎来，没有让我等，而是直接叫我去见校长——这可不是个好兆头。 3 Both the Principal Cardholder and Supplementary Cardholder are required to sign this application form. 信用卡主卡客户及附属卡客户须同时签署本申请表。
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