Why? One difficulty is to construct the agreements.

为什么呢？困难之一是起草这些协议。

There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by surrounding them in defensive formation.

长期以来，海员中流传着一种迷信的说法，认为海豚会把快要淹死的人托到水面，救人性命；或在人们周围列队保护，使他们免遭鲨鱼伤害。

In the conversion of saliva into poison, one might suppose that a fixed process took place.

人们可能认为，唾液转变成毒液，其中有固定的程序。

sank with all flags flying----in the harbour of the birth.

带着全身飘扬的彩旗，沉没在了它诞生的港口。

The idea of colonising Mars---- a world 160 times more distant than the Moon----

征服火星的计划-一个比月球远160倍的星球

Travellers on short trips to areas with water supplies of uncertain quality should avoid drinking tapwater, or untreated water from any other source.

短途旅行到水质不保险的地区时，应避免饮用水龙头的水或未经处理任何其他来源的水。