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1·In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand.

为了抵御潮汐，幼年马蹄蟹经常在沙子里挖洞。

2·Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.

令人惊讶的是，在潮汐流很弱的地方，幼年马蹄蟹的藤壶数量并不多，尽管它们很少在洞里活动。

3·After getting to town, the father got some cherries by selling the horseshoe.

进城后，父亲卖了马蹄铁，得到了一些樱桃。

4·There the farmer sold the horseshoe and with a few pennies he bought some cherries.

在那里，农夫卖掉了马蹄铁，用几便士买了一些樱桃。

5·The father said, Look! There is a horseshoe. Pick it up and put it in your bag.

父亲说：“看！那儿有一个马蹄铁。把它捡起来放到你的包里。”

6·One day, a farmer and his son Toby were on their way to town when the father found a horseshoe.

一天，农夫和他的儿子托比在进城的路上，父亲发现了一个马蹄铁。

7·When Thomas had eaten all the cherries, his father said to him, My dear son, if you had bent down earlier to pick up that horseshoe, it would not have been necessary for you to bend so many times for the cherries.

当托马斯吃完所有的樱桃后，他的父亲对他说：“我亲爱的儿子，如果你早点弯腰捡起那只马蹄铁，你就不必弯那么多次腰去捡樱桃了。”

8·For different individual horseshoe crabs, the circadian period ranged from 22.2 to 25.5 hours.

对于不同的鲎来说，其生理节奏的周期范围在22.2小时到25.5小时之间。

9·Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light.

人们发现，连续一年被关在黑暗的环境中的鲎仍然可以保持稳定的大脑活动节奏，这种稳定的节奏也使得它们的眼睛适应每日或明或暗的光线。

10·Stand in a horseshoe facing me.

面向我排成半圆形站著。

(1)horseshoe crab鲎

(1)horseshoe kidney马蹄肾