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(64) / 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
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abditive
alkenoxy
anteaters
automatic horizon
benzoclidine
blade centrifugal tensile stress
blot one's copy book
Botany Bay dozen
brace pile
circulatory function
clerid beetles
commercial sample
consisted in
correction shim
counter-pressure turbine
crusted ringworm
dog whelks
drisle
dysblennia
echo-ophthalmography
ecnoia
Ederah
Egyptian lupin
elongation at failure
estery feather
extraperiosteal bony growth
family Regalecidae
ffestiniog
four function paradigm(parsons)
fregata minor minor
fuzzy economics
geared gate valve
Gliocladium
go to the bad
hat parade
hydroflurocarbon
Japanese radishes
john thomas scopess
khalifat
komanic acid
kulivan
Larroude
law of imagery
lecithinemia
lexica
listening figures
low energy electron diffraction (leed)
malignant neoplasms
Mariestad
Markowitz moon camera
modally
mole coefficient
multi-impulse fatigue
name dropping
national railways
nimbinic acid
nonreversibility (irreversibility)
nucifraga caryocatactess
och
Ojika-jima
opposite parity
optical distance
organ-loft
outer gimbal
overfull groove
overlapping set
pattern rotation
pipe the eye s
post-ferment safe pressure stabilization valve
put toward
reader code
refooding phase
rootzones
Sakch'ang-ri
Sclerochloa
shopfloors
solid phase conversion
standard Gibbs free energy change
stress aging
subminiature capacitor
sucrose solution hemolysis test
Suecophiles
sun dance of minos (crete)
superfinisher
throat of frog
title part
topping heater
torque rotary actuator
trichospore disease
turbulent-flow core
turn sb against sth
TV transmitting antenna
two-point distribution
unified display interface
unpureed
Ushant
voltage amplifer
wall system
Wedderburn
wind-door
Winscales