1. I found that since there was no other person to work at it but myself, it would have to be ten to twelve years before I could go through with it; for the shore lay high, and at the upper end it must have been twenty feet deep.
    我发现，只有我自己，没有其他人帮忙，这项工程需要十到十二年的时间才能完成。因为河岸很高，从顶部算差不多有二十英尺。

2. I am deep into second thoughts, but there is no backing out now.
    我得再好好想想，但现在已没有退路了。

3. For a few hours, you settle back in a deep armchair to enjoy the flight.
    几小时之内，你躺在扶手椅上，享受着旅途的欢乐。