vocal: expressing opinions or feelings freely or loudly

vocal: adj 本意是“发声的”，可以引申为直言不讳的，对...敢于直言的、强烈的。我们今天来学习这个词的引申义。在口语和写作中均可使用。

著名作家郑渊洁一直是素质教育坚定的推行者和实践者。

The famed Chinese writer Zheng Yuanjie is a vocal supporter and practitioner of quality-oriented education. 

团队领导直言不讳地表达了他对城市活动结果的不满。

The team leader has been very vocal in his displeasure/discount over the marketing result.

强烈谴责D&G言论

Some KOLs (key opinion leaders) were vocal in condemning the Italian fashion brand D&G's racially discriminatory commercial last year.

《经济学人》

1. Mr Liikanen was a vocal advocate of unconventional tools.  Mr Weidmann is the most contentious candidate. His vocal opposition to ECB asset-purchase programs was reportedly derided by Mr Draghi as "Nein zu allem" ("No to everything")

2. In Hong Kong Mr Yau says Taiwan's experience underscores the importance of winning hearts and minds. Equal-rights proponents are adamant that the basic rights of minorities should not be the subject to a vote by the majority. But, says Mr Yau, there is a need to engage with the most vocal critics. It helps that homosexuality is no longer a taboo among the young. Public opinion is moving in favor of same-sex marriage. 

应用：

1） 他强烈支持这个方案。

He is a vocal supporter of this proposal.

2) 对于教授应该把研究放在第一位，他持强烈的批评态度。

He is a vocal critic of the view that professors should put research first.