1.allowance n.允許( permission)；津貼，補助費(subsidy)

詞根記憶：來自allow(礦允許)，允許拿到的或省下的錢_津貼，補助費

例:financial allowances財政津貼

2.allude v.(to)間接提到，暗指( to make indirect reference)

詞根記憶：aI+lud(嬉笑)+e--在嬉笑中說--間接提到

例:The author alludes to the well-established nature of the concept of individual rights in the Anglo-Saxon tradition.

派生詞:allusive(a.暗指的，影射)

同根詞：ludicrous(a.可笑的，滑稽的)：elude(礦躲避)

3.alluvial a.沖積的，淤積的( made of sand, earth left by rivers or floods, esp. ina delta)

例:alluvial gold沖積金礦

4.ally v.（使）結盟（to unite）n.同盟者，同盟國(person, country, that joined with another in order to give help and support)

例:During World War ll,Great Britain allied with the United States.

派生詞:alliance(n.結盟，聯盟)

5.alpha n.希臘語字母表的第一個字母(A，a)

詞根記憶：發音記憶

6.alter v.改變，變更(to change)

本身為詞根：改變

例:The period of an organism's biological clock can be altered by environmental factors.

派生詞:alteration(n.改變，變更)；alternative(a.二者擇一的)

7.alternate a.交替的，更迭的((of two things) happening or foltowing one after the other regularly);v.交替，輪流(to cause to occur by turns)

詞根記憶：alter(其他)+nate --可以有其他的--交替的

例:To maintain the nutrients in the soil, corn and soybeans are often planted in a field in altemate years.

8.alternative a.輪流的，交替的( atternate)；兩者（或兩者以上）擇一的(offering or expressing a choice)；n.二中擇一；供替代的選擇(something which can be chosen instead)

詞根記憶：alter(改變狀態，其他的)+native(…的)--其他的一兩者擇一的

例:For most commuters who use the subway system, there is no practical attematwe public transportation available.

派生詞:alternatively(ad.非此即彼；二者擇一地)

同根詞：alterable(a.可改變的)

9.altitude n.高度( height above sea-level)

詞根記憶：alt(高)+itude--高度

例:The plane was flying at an altitude of 2,000 feet.

10.altruism n.利他主義，無私（unsetfish devotion to the welfare of others）

詞根記憶：altru(其他)+ism(主義)--利他主義

例:Altruism means doing good things simply because the good things are worth doing.

派生詞:altruistic(a.利他的)：altruist(n.利他主義者)