ivory
n.象牙,象牙材质（不可数）
A grown male elephant has two long tusks of ivory.
成年公象有两条长牙。
Many elephants were killed for their ivory.
许多大象因为它们的象牙而遭捕杀。
stubborn
a.顽固的
Jane wanted to try traveling abroad all by herself, but her stubborn parents wouldn't let her.
珍想要试试独自一人出国旅行,但她固执的父母亲不答应。
Can someone help me talk some sense into this man? He as stubborn as a mule!
有人能帮我说说这个人,让他明理一点吗？他简直像骡子一样固执！
rid
vt.使摆脱 a.摆脱的
The police chief promised he'd do whatever he could to rid the city of crime.
警察局长承诺将竭尽所能让该城免于犯罪侵扰。
We all felt it was a great relief to get rid of Bob. He was such a nuisance.
能摆脱鲍伯，大家都松了口气。他真的很惹人厌。
moist
a.潮湿的，带水气的
The warm and humid climate here makes it a perfect place for tropical fruits.
该地温暖且湿度高的气候很适合种热带水果。
Frogs live near wet places to keep their skin moist.
青蛙靠近湿地居住以保持表皮湿润。
moisture
n.湿气，水分
Moisture is taken out of the air by this machine, after which it turns into water.
湿气被这台机器从空气里抽出，之后便转变成水。
cleaning
n.打扫
Matt sometimes helps his mother do the cleaning.
麦特有时候会帮妈妈打扫。
laundry
n.待洗衣物（集合名词，不可数）
I used to do the laundry once a week when I lived in the dormitory.
我以前住宿舍时一星期洗一次衣服。
tumble
vi.跌倒
Tom tumbled down the stairs and got a few bruises.
汤姆从楼梯跌下，身上带了几处瘀青。
chill
n.寒冷；恐惧，寒意；感冒
I felt the chill in the air when I left home this morning and realized that winter was around the corner.
今天早上我出门时感到一阵寒意，知道冬天就要到了。
David suddenly realized, with a chill of fear, that his business partners had been plotting against him.
大卫倒抽一口凉气，突然发现自己的生意合伙人一直对他图谋不轨。
Dry your hair before you go out, or you'll catch a chill.
把你头发吹干再出门，不然你会着凉的。
chilly
a.寒冷的
It is getting chilly in here. Let's turn the heater on.
这里头愈来愈冷了。把暖气打开吧。