descend和ascend1）desend单词中头两个字母“des—”是这个单词的前缀吗?（2）ascend单词中头两

descent (noun)the state or fact of being related to a particular person or group of people who lived in the past:
She's a woman of mixed/French descent.
They trace their line of descent back to a French duke.
He claims direct descent from Mohammed.
descend (verb)
[I or T] formal to go or come down:
The path descended steeply into the valley.
Jane descended the stairs.
› [I] literary If darkness or night descends, it becomes dark and day changes to night.

Descend指缓慢或渐进的移动,多是从斜坡下降.例如：mountain climbers descending from their overnight camp near the peak’s summit（从巅峰附近过夜的营地爬下的爬山者）;
decrease (名词亦为decrease,但重音在第一个音节上)强调数目或使人不快之物的逐渐减少.
如:to decrease the number of working hours,to
decrease traffic accidents.
The workmen want to decrease the number of working
hours and increase pay.
工人要求减少工作时间而增加工资.
reduce
可以表示尺寸、数量、程度或强度的减少,词义引伸之后,可以表示地位、处境、状况的降低.如:to reduce the speed,to reduce
household expense,to be reduced to tears,to be reduced to ashes.
This greatly reduced the speed of the ship ,for
there was danger that if she travelled too quickly,this rudder would be torn
away.
这大大减低了船速,因为如果它走得太快,这个舵会有被冲掉的危险.reduce 的名词为reduction,

Soon afterwards,the balloon,which began to descend,landed near an airfield.非限定性定语从句

就只有hided－－hidden
I have been there twice to seek for a feeling descended from
our ancestors,which has hidden away from me for a long time.

men were descended from apes这句话里的不是被动语态.是用了be descended from这个词组.说得再深一点就是作者自己习惯写了be动词,既然写了自然就不能再用动词原形,所以用descended,这句话可以写Men descended from apes.

1.loads of sth.= plenty of sth.大量 这个用法主要在口语当中,load是名词
descend on 突然出现
感觉bus应该是复数才对.loads of tourists后置定语修饰several buses.
“几辆载满游客的巴士突然出现在小镇.”
2.it 和its是一个系列,ta,ta的,具体ta指谁要看前文了；way指的是路；trace追踪,但是trace its way不能译为“追踪ta的路”,其实就是“ta的踪迹”.所以我会翻译成“我们发现ta穿过树林（逃跑了）.”
3.可以改.in it地点状语.地点状语、时间状语都是放在句子两头的,这里放在开头是强调的作用,挪到句尾对句意完全无影响.
there is a boatman句子主干.asleep形容词作后置定语修饰boatman,fast副词修饰asleep,不是“快”,而是“睡得很熟”
“在那里面,一个船工睡得正熟.”

derive from 由...衍生而来
例句：Thousands of English words are derived from Latin.
数以千计的英语词汇源自拉丁语.
descend from 起源于（遗传,物种性）
men were descended from apes.
人由类人猿进化而来.

land是降落,登陆.到达地面上的意思.
Jump for the sun,at least you land on the moon.
目标定的高一点有好处.（意译）
descend是下降.指空间方位的向下移动.
Descend the rapids of the river.
顺激流而下
These fish winter up the river and descend to the sea in the spring.
这种鱼在河的上游过冬,到春天则顺流入海.

首先descend只能做动词,表示下降,随着,还有遗传（一般是指财产或权利》
而lower 可以做形容词和动词,做动词的下降,表示的是降低,减弱