n. 下来，下降
The descent is more difficult than the ascent. 上山容易下山难。
[反]ascent
n. 血统，世系
He is a man of noble descent. 他出身名门。
[同]ancestry
designate
vt. 指明,指出
designate boundaries 表明界限
vt. 指派，指定
He designated Smith as his successor. 他指定史密斯为他的继承人。
desolate
adj. 荒芜的，荒凉的
[同]deserted
adj. 孤独的，凄凉的
She lived a desolate life. 她过着凄凉的生活。
[同]lonely
dessert
n. 甜食，点心
destine
vt. (常用被动)命中注定
They were destined never to meet again. 他们命中注定将永不再见。
[同]doom
vt. 预定，指定
[同]predetermine
degradation
n. 降级[反]elevation
n. 堕落;退化(生物)
degrade
v. (使)降级;(使)堕落
degrade oneself by cheating 因欺骗而自甘堕落
v. (使)退化
delegate
n. 代表
[同]representative
deliberate
adj. 深思熟虑的，蓄意的
a deliberate lie 存心的谎言
[同]intentional
adj. 审慎的，不慌不忙的
a deliberate speech 从容而谨慎的演说
deliberately
adv. 审慎地，蓄意地
denial
n. 否认
They didn’t admit his denial of guilt. 他们对他否认有罪不予承认。
[同]negation
n. 拒绝
the denial of a request for help 拒绝他人的求助
[同]rejection
[难点]
make a denial of … 否认…
denote
vt. 指示，表示
[同]indicate
vt. 意味着
The sign x usually denotes an unknown quantity. 符号x通常代表一未知数。
[同]mean
