替换测试 Group 1

Bats find their way in the absence of light .

Bats are not the only creatures to face this difficulty today.

Our mammalian ancestors managed to survive .

Given that there is a living to be made at night, and given that alternative daytime trades are thoroughly occupied, natural selection has favored bats that make a go of the night-hunting trade .

Weapons designers adapted this technique for the detection of submarines.

Second world war relied heavily on these devices.

Engineers had already built instruments to exploit the principle, for example to measure the depth of the sea under a ship.

Donald Griffin coined the term ‘echolocation’ to cover both sonar and radar, whether used by animals or by human instruments.

Water infrastructure must be built to higher specifications and with more accountability to local people and their environment.

Governments should maintain ownership of water infrastructure.

We often remember what we have perceive peripherally , long after we have forgotten what we set out to learn.

The teaching activities are similar to those used in conventional classes . 

最后，你是否愿意继续参与下一次同样形式的打卡活动呢？