They usually operated in bands between ten and twenty strong and relied for survival on difficult terrain and bad transport.

他们通常以10到20人的队伍作战，很坚强，依靠艰难的地形和糟糕的交通条件生存下来。

youdao

Palau has only been an independent nation for twenty years and has a strong history of environmental protection.

帕劳成为一个独立的国家只有20年，但在保护环境方面已有长久的历史。

youdao

In a time of rationing, this is not an idea that can be realized on every day of the week, but I maintain that one strong cup of tea is better than twenty weak ones.

在配给制下，一周中每天都能做到这一点不现实，但我仍然认为一杯浓茶胜过二十杯淡茶。

youdao

These include hearing a roaring or sucking noise, seeing the ocean suddenly pull back or rise, or feeling a strong earthquake that lasts more than twenty seconds.

VOA: special.2011.06.07

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