楔形磷块

The little splints of wood which we call matches are made out of deal or pine wood which has been soaked in melted paraffin wax to make it burn more easily. 这种被我们称之为火柴的薄木片由欧洲赤松(松树)制成, 在液体的石蜡

发表于:2018-12-18 / 阅读(40) / 评论(0) 分类 英国学生科学读本

This is Scientific American's 60-Second Science, I'm Christopher Intagliata. Got a minute? Life on earth requires six basic ingredientscarbon, hydrogen, nitrogen, oxygen, sulfur and phosphorus. Those six elements are the building blocks for DNA and R

发表于:2019-01-08 / 阅读(63) / 评论(0) 分类 Scientific American(十二)月

The commercial potential for the stuffwhich soon became known as phosphorus, from Greek and Latin roots meaning light bearingwas not lost on eager businesspeople, but the difficulties of manufacture made it too costly to exploit. An ounce of phosphor

发表于:2019-01-29 / 阅读(54) / 评论(0) 分类 万物简史

Taxes on wage income vary heavily around the world. 世界各地的工资税率大不相同。 The OECD recently published a report comparing the tax burden on wages in the world's developed economies. One of the main measures the OECD used in the re

发表于:2019-02-05 / 阅读(101) / 评论(0) 分类 阅读空间

A man went into the woods.He felled a tree,and began to cut it into pieces.He lifted one end of the tree on the stump,sat astride up-on it,and began to saw.Then he drove a wedge into the cleft,and began to saw farther along;then he re

发表于:2019-02-18 / 阅读(53) / 评论(0) 分类 趣味英语

Matches Striking matches, on this Moment of Science. Have you ever had a problem getting a match to light? If so, you might be using the wrong type of match. There are actually two different types of matches: safety matches and strike-anywhere matche

发表于:2019-02-26 / 阅读(64) / 评论(0) 分类 英语听力文摘 English Digest
学英语单词
abscessed
accompany sb to
advanced analysis
anaphase-promoting complex
aretha
auxiliary circuit transfer switch for shed supply
base pitch error
bell and spigot bend
blaska
blister pearl
bring under control
butaabartal
change presser device
cloud to cloud discharge
condenser bent-tube
conducive to
crowded waters
cultrate
cyberdeck
daguerreotypic
direct acting hoist
direction of propagation
effective width of gap
emblematicize
emission spectrophotometry
endolymphatic sac decompression
evaluate on
exploration stage
Fond du Lac County
foreign settlers
formal sector
formatted input
free-atom cross-section
galactoheptulose
gimballed electrostatic aircraft navigation system
grey micaceous iron oxide alkyd enamel
grosches
grudgeries
gun-towers
Han Solo
he-nes
herba cynomorii
hopeis
hot-pressure welding
hydrargyro-iodohemol
hydrocarbon polymer
hydrooptics
inland water drilling rig
instinctive impulse
jewel-weed
juggings
Kikori
kir-
lateral clearance
machining constant
malie
marginal expense
mechelin
metathelypteris gracilescens
Mlicrococcus oxycyanogenes
moiley
mop-up delay equalizer
moroti
mosfet simulations
muhlenbergias
najibullahs
Naples garlic
new generation
Nojiri
offer something up
oratorships
palaeocene series
penetrant technique (pt)
phacoanaphylactic endophthalmitis
precondition-prerequisite
proportional sam pling device
pseudotrichomes
put on a show
pyriminil
qui tam
radio beacon and direction finding station
rattle boxes
regional application
rocker arm linkage
run-time library
scanheads
sekret
separate sources
sheppard's corrections
simple concrete mixing plant
sliding rupture
steering clutch release rocking lever
subsidiary wire
tape squeal
third-price auctions
title-
undevoured
visualization of flow
wellfares
white-lipped snail
yelper
zirconsulphate