1.Seawater 海水
Tide pool 潮池; 潮水潭
Crab [kræb] n. 蟹，螃蟹
Starfish ['stɑr'fɪʃ] n. 海星
Sea urchin ['ɜːtʃɪn] n. 海胆
2.Addend ['ædend] n.加数
If you change the order of the addends, you get the same sum.
如果更改加数的顺序，则得到相同的和。
3.Cactus ['kæktəs] n. 仙人掌
复数：cacti ['kæktaɪ] /cactuses
Mark's favorite plant is a cactus.
马克最喜欢的植物是仙人掌。
Jackson likes big cacti.
杰克逊喜欢大仙人掌。
Have you ever seen a cactus?
你见过仙人掌吗？
Spine [spaɪn] n. 刺
Stem [stɛm] n. 茎
Cacti have sharp leaves called spines. They have thick stems that store water.
仙人掌有锋利的叶子，叫做刺。它们的茎很厚，可以储存水分。
4.Hour ['aʊr] n. 小时
Morning, afternoon, and evening are times of the day.
早上、下午和晚上是一天中的时间。
Minute hand 分针
Hour hand 时针，短针
Look at the picture. The hour hand is shorter.
看这幅画。时针较短。
It points to the hour.
它指向的是小时。
The hour hand is on 5. It's five o'clock.
时针指向5。五点钟了。
The minute hand is longer.
分针更长。
It points to the minutes.
它指向的是分钟。
The minute hand is on 12.
分针指向12。
5.Half hour 半小时
The minute hand points to 6. The hour hand is between 5 and 6. It is 5:30 or half past 5.
分针指向6。时针在5到6之间。现在是5点半。
The buses leave in order every half hour.
公共汽车每半小时一班。
6.Clock [klɑk] n. 时钟
Analog clock ['ænəlɔg] 指针式时钟
Digital clock 数字显示式时钟
Where are the hour hand and the minute hand when it is 7 o'clock?
四点钟的时候，时针和分针在哪里？
7.Recess ['risɛs] n. 休息/v. 休息
What time do they go to recess?
他们什么时候去休息？
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