already【 ɔ:l'redi】 
adv.已经
Your team has already lost.
你们队已经输了。
It is already time to go to mother's house.
已经是去母亲家的时候了。
also【 'ɔ:lsəu】 
adv.也,同样
We are also vegetarians.
我们都是素食主义者。
Do you also sell fabric here?
你这里也卖衣料吗?
alter【 'ɔ:ltə】 
v.改变
Do not attempt to alter the facts.
别妄想改变事实。
Scientists can easily genetically alter adult cells.
科学家能很容易地改变体细胞的基因。
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alternate【 ɔ:l'tə:nit】 
adj.交替的,轮流的,预备的;v.交替,轮流,改变
Most farmers alternate crops.
多数农民实行庄稼轮种。
Night and day alternate.
昼夜交替。
alternative【 ɔ:l'tə:nətiv】 
n.二中择一,可供选择的办法,事物;adj.选择性的,二中择一的
Doctors these days are turning to alternative medicine to help patients cure their diseases.
医生这几天正在转用替代药物来帮助治好患者的病。
Alternative rock music is losing popularity.
另类摇滚音乐正失去人气。
although【 ɔ:l'ðəu】 
conj.虽然,尽管
Although silly, the book was entertaining.
虽然无聊,但这本书颇具娱乐性。
Although it is clean, it still needs to be replaced.
虽然它还很干净,但是它还是要被换掉。
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altitude【 'æltitju:d】 
n.(尤指海拔)高度,高处(海拔甚高的地方),(等级、地位等)高等
At what altitude are we flying?
我们的飞行高度是多少?
What is the altitude at the top of this mountain?
这座山海拔多少?
altogether【 ,ɔ:ltə'geðə】 
adv.完全地,总而言之
How much do these things cost altogether?
这些东西加起来多少钱?
That's altogether different.
那是完全不同的。
aluminum【 ə'lju:minəm】 
n.[化]铝;adj.铝的
Aluminum doesn't rust at all.
铝根本不会腐烂。
The spring board is made of an aluminum extrusion.
这个跳板是由铝型材挤压而成。
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