请注意这不是一封官方信件。
美亚混血儿的母亲毁掉或藏匿起能提供他们与美国人有联系的照片、信件和官方文件。
Mothers of Amerasian children destroyed or hid photographs, letters and official papers that offered evidence of their American connections.
BEC测试考查人们起草官方商务信件所必需的专业词汇以及电话交谈的口语能力。
The BEC exam tests one's specialized vocabulary needed to draft official business letters, as well as spoken language for telephone communications.
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