Investors must be prepared for the stock market indices to constantly fluctuate.
投资者必须为股市指数的持续波动做好准备。
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讲 Fundamentally, the USPS is in a historic squeeze between technological change that has permanently decreased demand for its bread-and-butter product, first-class mail, and a regulatory structure that denies management the flexibility to adjust its operations to the new reality.
但从本质上看,美国邮政署正处于具有历史意义的技术革新与监管结构的双重压迫之下:一方面,技术不断调整升级,致使其

品特快邮件的需求持续走低;另外一方面,监管结构拒绝灵活的管理,无法与时俱进。
讲2017 
精选合辑 If you're a healthy older child or adult, watch out for sudden dizziness, severe, persistent vomiting, difficulty breathing, pain or pressure in the chest or abdomen, and flu-like symptoms that improve, then return with a fever or worse cough.
如果你是一个健康的大孩子或是成年人,要当心出现突然
晕,严重,且持续的呕吐,呼吸困难,胸腹闷痛的症状,这些疑似流感的症状会恶化,继而出现发烧或是严重咳嗽的现象。