arduous [ˈɑːdjuəs]
hard to accomplish or achieve
hard to climb
adj. 努力的；费力的；险峻的

例句
It must have been a very arduous task to build the Pyramids.
当时建造金字塔肯定是件万分艰巨的事。
He made an arduous effort to keep up with the rest of the class.
他努力跟上班上其他同学。
an arduous hill
陡峭的山

contiguous [kən'tiɡjuəs] contact touch tac tig
next to or touching another, usually similar, thing
next or near in time or sequence
touching or connected throughout in an unbroken sequence
adj. 接触的;连续的；邻近的

例句
California and Mexico are contiguous.
加利福尼亚和墨西哥相邻。

contiguity[,kɔnti'ɡju:iti]
n. 邻近，接触

steward stew stove ward

stew [stju:, stu:]
to become cooked by stewing
to cook meat, fish, vegetables or fruit slowly and gently in a little liquid
炖，炖汤；焖；使极度不安[(+up)]（引申义，不难理解的吧，就是那种煎熬的感觉）

例句
We stewed the tomatoes with peppers.
我们用辣椒炖番茄
She was so stewed up with anxiety that she couldn't sleep.
她焦急万分,觉也睡不着。
She is all in a stew over her lost suitcase.
她因丢失衣箱焦急万分。
She has been stewing over this thing all night.
她为此事整夜坐卧不宁。

stove [stəuv]
a piece of equipment which burns fuel or uses electricity in order to heat a place
MAINLY US a cooker
火炉

ward [wɔ:d] guard c-k-g-h
录音时忘说了，补充下，比如说higher,gh表意但不发音
所以g在guard中可以理解为发音但不表意
to do something to try to protect yourself from something bad, such as illness, danger, or attack
保卫；守护

steward ['stju:əd]
a person whose job it is to organize a particular event, or to provide services to particular people, or to take care of a particular place:
a person who serves passengers on a ship or aircraft
UK a person who organizes the supply and serving of food at a club
n. 管家；乘务员；膳务员；工会管事
vi. 当服务员；当管事
vt. 管理

stewardess['stju:ədis]
n. 女管家；女干事；女服务员

例句
He went around the world as a ship's steward.
他当客船服务员,到过世界各地。
His neighbor is a chief steward.
他的邻居是一个乘务员领班。