pole n （地球的）极
flight n 飞行
explorer n 探险家
lie v 处于
serious adj 严重的
point n 地点
seem v 似乎，好像，看起来
crash v 坠毁
sack n 袋子
clear v 越过
aircraft n 飞机
endless adj 无尽的
plain n 平原

South Pole 南极
North Pole 北极
Pole Star 北极星
explore v 探险
exploration n （科研相关）探索，探求，开发
adventure n 冒险（追求刺激）
venture n 冒险（为了财富，没有生命保障）
tell a lie 撒谎
lie n 谎言；lie v 撒谎 Eg. you lied。you liar！
lie，lied，lied撒谎
lie，lay，lain 处于，位于
stay in bed/lie in bed趟在床上
lie现在分词－－》lying
lay v 放，放置：lay an eff 下一个蛋
lay vt. lay sth ，lay，laid，laid
hang，hung，hung挂，悬挂
hang，hanged，hanged绞刑
you lied！
you lied to me
lie in bed
point点，一般指从飞机上向下看的点
地点place，spot
dot 点
@-->at

seem ＋ as if
seem ＋ adv
seem to be
seem that
Eg.：he seems rich。
he seems to be rich
it seems that he is rich
it seems that 看起来似乎
seem as if看起来似乎
Eg.:he seems as if he had never lived in England before

crash（从上向下掉）
aircrash空难
strike 撞击
clash撞击，冲突

over 越过（距离）
clear （凌空）越过
go over飞跃
clear the mountain飞跃山峰
the horse cleared the fense
mountains 高山
plain girl 平凡的女孩
i'm a plain girl

text

In 1929, three years after his flight over
the North Pole, the American explorer,
R. E. Byrd, successfully flew over the
South Pole for the first time. Though, at
first, Byrd and his men were able to take
a great many photographs of the moun-
tains that lay below, they soon ran into
serious trouble. At one point, it seemed certain that their plane would crash. It
could only get over the mountains if it rose to 10,000 feet. Byrd at once ordered
his men to throw out two heavy food sacks. The plane was then able to rise and
it cleared the mountains by 400 feet.Byrd now knew that he would be able to
reach the South Pole which was 300 miles away, for there were no more mountains in sight. The aircraft was able to fly
over the endless white plains without difficulty.

exercises：
can－－可能性
be able to－－可能性，强调成功地做

4......
could与过去时态有关，强调可能性
be able to强调成功地做
用过去式表达，表示在过去发生
过去完成时，强调在过去地过去
5...d...
could rise －－有可能，不知道结果
might rise －－可能
might succeed in rising－－可能成功地做
rose－－没有情态动词，表示已经成为事实
6...d...
be able to
was/were able to－－表示这个动作在过去成功地做
will be able to--将来可能会成＝can