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caveman n. 洞穴人，粗暴的男人=cave dweller洞穴人
pot-holing n. 洞穴探险 也作potholing=caving
pothole 坑洞，锅穴
pot-holer 洞穴探险者
solitude n.孤独，独居，荒僻之地，幽静的地方
He passed twenty-four years in solitude.
loneliness n. 孤独， 寂寞
This famous explorer finally died in loneliness.
这位著名的探险家最后在孤寂中死去。
Loneliness in a gloomy raining day may be unbearable to him.
对他来说，阴郁的雨天的寂寞是难以忍受的。
lonely adj. 寂寞的，荒凉的
A lonely star shone out against the black sky.
一颗孤星在黑色的夜空中闪闪发亮。
aloneness n. n. 孤独感， 单独
When a person cannot kill aloneness or find no one to communicate, no one to understand his life, the people will get angry.
当一个人不能打发孤独,找不到可以交流的人,没有人能理解他,便会积怨于心。
alone
adj. 单独的，独自一人的，孤单的
adv. 独自地，仅仅
Do you ever take the subway alone late at night?
你有没有在深夜单独乘过地铁？
You can't live on bread alone.
你不能仅靠面包维生。
