调查显示她在出现症状的两天之前曾到菜市场购买鸡肉和鸡蛋。
The investigation indicated that she visited a wet market to buy chicken meat and eggs two days prior to symptom onset.
它是什么时候开始的? 大概两天之前。（注意时态）
两天之前，公司宣布它已经在加州公路上测试过一个自动驾驶电动车。
Two days ago the firm announced it had tested a self-driving electric car on Californian highways.
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