这几种动物的名字其实都学过，不过容易混淆。所以再总结一遍。加上图片辅助记忆就容易多了。

baboon:

http://s13/bmiddle/49618625g65ca3180bb7c

Any of several large, terrestrial African and Asian monkeys of the family Cercopithecidae, especially of the genus Papio  or  Chaeropithecus  and related genera, characterized by an elongated, doglike muzzle, a short tail, and bare calluses on the buttocks.
狒狒：一种猕猴科的大型、陆生的非洲和亚洲的猴子，尤指狒狒属 或 Chaeropithecus 及相关的种属，其特征为有一长的象狗一样的口鼻和短尾，臀部有一裸露的胼胝

gibbon  （在泰国看过gibbon）
n.
长臂猿

http://s8/bmiddle/49618625g65ca362d0da7

Any of several small, arboreal apes of the genus Hylobates  of southeast Asia and the East Indies, having a slender body, long arms, and no tail.
长臂猿：一种体小、生活于树林中的长臂猿属 类人猿，产自东南亚和东印度群岛的，有瘦长的身躯、长臂且没有尾巴

chimpanzee
n.
[动]非洲的小人猿, 黑猩猩

http://s1/bmiddle/49618625g65ca41ab2c20

ape
[eip]
n.
猿

Any of various large, tailless Old World primates of the family Pongidae, including the chimpanzee, gorilla, gibbon, and orangutan.
无尾猿，类人猿：一种猩猩科大而无尾的东半球灵长目动物，包括黑猩猩、大猩猩、长臂猿和猩猩

primate
灵长类的动物

gorilla
n.
大猩猩

http://s5/bmiddle/49618625g65ca4d6b0624
n.（名词）
The largest of the anthropoid apes (Gorilla gorilla)  native to the forests of equatorial Africa, having a stocky body and coarse, dark brown or black hair.
大猩猩：栖居在赤道非洲的最大的类人猿（大猩猩） ，体型粗壮，头发很粗，呈深棕色或黑色

orangutan
n.
猩猩

orangutan
http://s11/bmiddle/49618625g65ca49ac68aa
An arboreal anthropoid ape (Pongo pygmaeus)  of Borneo and Sumatra, having a shaggy reddish-brown coat, very long arms, and no tail.
猩猩：一种大型的树栖类人猿（猩猩 猩猩属） 产于波罗门和苏门答腊，有稀疏的红棕毛皮、很长的臂且无尾