时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课
Humans have used many devices 2 to measure time. The sundial was one of the earliest and simplest. A sundial measures the movement of the sun across the sky each day. It has a stick or other object that rises above a flat surface. The stick, blocking sunlight, creates a shadow. As the sun moves, so does the shadow of the stick across the flat surface. Marks on the surface show the passing of hours, and perhaps, minutes. The sundial works 3 well only when the sun is shining. So, other ways were invented to measure the passing of time. One device 1 is the hourglass.The hourglass is shaped like the number eight --- wide at the top and bottom, but very thin in the middle. In a true "hour" glass, it takes exactly one hour for all the sand to drop from the top to the bottom through a very small opening in the middle. When the hourglass is turned with the upside down, it begins to mark the passing of another hour. By the eighteenth century, people had developed mechanical 4 clocks and watches. And today, many of our clocks and watches are electronic.
 

n.器械,装置;计划,策略,诡计
  • The device will be in production by the end of the year.该装置将于年底投入生产。
  • The device will save much time and effort for us.这种装置会使我们节省大量时间和气力。
n.设备;装置( device的名词复数 );花招;(为实现某种目的的)计划;手段
  • electrical labour-saving devices around the home 节省劳力的各种家用电器
  • modern labour-saving devices such as washing machines and dishwashers 诸如洗衣机和洗碗机之类的现代化省力设备
n.作品,著作;工厂,活动部件,机件
  • We expect writers to produce more and better works.我们期望作家们写出更多更好的作品。
  • The novel is regarded as one of the classic works.这篇小说被公认为是最优秀的作品之一。
adj.机械(学)的;力学的;机械似的;手工操作的
  • He borrowed a mechanical book from me.他从我这儿借了一本力学方面的书。
  • He looks very mechanical.他看上去非常呆板。
学英语单词
ait mohad-berber
al-sistani
Ath Thumayd
backpacked
Barbudians
bat-eyed
benign lymphocytic meningitis
bibliopolistic
bottom
bowl refractor
Brisssud-Sicard syndrome
broadband wireless
buttonquail
buzzword-compliant
cannot be overestimated
capacity bridge
casing stay
cavity ionization chamber
chorotegans
color additive
coordination system
crannage
crop chute
cytomatrix
delicate fruit
dog bones
dummy-flange
electromagneticore separator
elevated floor type substructure
elliptical projection
endothermic reaction of mixing
external braced aeroplane
field crop cultivating
flechita
folk theorems
free pretique
frontal arc
giant network
Grotthus mechanism
has no regard for
high polymer anti-wear strip
interstage circuit
ipomoein
iron oxide basic
karlotoxin
king-pins
Kummerower See
lacrimal canal
Lebombo Mountains
lines per inch
loam clay
Meconopsis paniculata
micro metrics
military air transport service (mats)
musculus levator
nasirdin
near gravity material
Nelaton's sphincter
o-phthalic acid
out-of-hand
partly-finished goods
pemphigus benignus
photoconsistencies
phytotoxemias
platyphylline
polydirectional core loss
post defecation
presentation of the cheque
prevails
quality inspector
reach one's limit
rhandir
rotating tumbling-barrel-type mixer
salesboys
screw-pitch
see fit to
siogen
sitha
slow filling phase
spring pocket
stainless steel wool
stand-up bassists
stipendiary judge
super-heated
SWESSAR (standard plant)
tadee
toolboxes
total access communication system
travel stop
turkish hizballahs
umcommercial
uncourteousness
vacuum suction plate
vein of pterygoid canal
ventilating lung qi
Vershino-Shakhtaminskiy
weather cycles
wet behind the ear
winkle picker
with good grace
yousaf
Zener transition