1. We realized that they must have become unduly frightened by the rising flood.
    我们看得出，上涨的洪水一定使他们怕得过分了：他们的房子有极好的地基，即使大水没顶也能稳当地顶得住。

2. We realized that they must have become unduly frightened by the rising flood,
    我们意识到他们一定是被不断上涨的洪水吓坏了。

3. The Victorian habit of mind was unduly preoccupied by what was socially and morally convenient.
    维多利亚时代的心理习惯所过度迷恋的是社交和道义的投合.

4. The Victorian habit of mind was unduly preoccupied by what was socially and morally convenient.
    维多利亚时代的心理习惯所过度迷恋的是社交和道义的投合.

5. A disunited nation therefore has to incur unduly high costs of government.
    因此，一个处于分裂的国家必须要支付过高的行政管理费用。