大约一个星期之前
About a week ago
以上为机器翻译结果，长、整句建议使用 人工翻译 。
大约三星期之前突然出现了反常的低气压，当我们遭遇它的影响后，又产生了一个低气压，让我们更加偏离了航向。
Some three weeks ago it suddenly produced an atypical depression. Then, after we had surfaced from its effects, it produced another and sent us even farther off course.
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