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
acrocephalus agricola
adjudgements
ain sefra
alkali-loving
amerikaner
Apollo instrumentation
apophlegmatizant
Ardlethan
axial focusing
baked-porcelain-veneer crown
balausstine
Blaengwrach
board of underwriters of new-york
bond office
bossiest
British Standard Whitworth Screw Thread
bush shrike
CANMARPAC
charging arrangement
clay-pit
coal gangue wool
consulting-rooms
crystl
current, leakage
dairy corral
debordment
delay representation
dislocation vein
English black mint
enumerated
ewteuth
expected discharge disposition
find-fault
Foulger's test
frame work structure
gasogenous
geodynamic meter
giving over to
gleim
Gynostemma pentaphylla
hana no ko teki tai (japan)
home wrecka
homeomorphically
hydrokonite (hydroconite)
hylozoisms
immote
in inverse ratio
industrialism
interrupt vector address
isolating and maintaining
Livingstone sphere
longdon
low decay
lowering speed control valve
macrocolumn
malde
marianus
melon-shaped dome
mental setae
Myokombin
nazaris
nevirapine
nitrosyl ruthenium
nitrosylated
nonlinear approximation
nonlinear optimal control
oiling
Paepalanthus
Palodeia
particle stoppage
pipelaying
plainsmen
potassium uranate
product value chain
quasi-radical ring
rising and setting
Rochon Prisms
rock pools
roomful
rosinweeds
running by
santrock
semi-flush cutting
shootouts
show-quality
ssis
straight-lacedly
Streptobacterium
supertonic seventh
tautomerizm
telegraphical
telemetry computer word
the brink of
third phalanx
threatening weather
thyristor controlled reactor
tractors
transmission line spacing
unappertaining
veinlet
videocard
weapons hold