109. Why do we have blood and what does it do? 195 2023-03 3 108. How do water slides work 174 2023-03 4 107. Carrots give you night vision! And other things adults say 207 2023-03 5 106. Don't swallow gum! And other things parents say ...
All blood cells (red cells, white cells and platelets) develop from haematopoietic (literally meaning "blood-making") stem cells, located in the bone marrow. It has recently been found that manyplatelets are made in the lungs, from megakaryocytes that have migrated there from the bone marrow....
原文 Why do we blush? Your cheeks may have turned red before. Maybe it was after you did something silly in front of other people. This is called blushing, and it happens to most of us. Some scientists in the Neth...
Why do we have different blood types? Scientists estimate that blood types have been around for at least 20 million years. But doctors have only known about them for the last 116 years.Before 1900, countless people died after they were injec...
OK, so now we know why the blood is there. And it's a pretty significant amount. It's 30 to 90 milliliters of blood, which is one to three ounces, and it can be more, and I know it seems like it's more a lot of the times. I know. So why do we have so much blood?
Lesson2WhyDoWeNeedHumour？单词检验 1．musclen.___肌__肉___2．bloodvessel___血__管___3．moodn.___心_情__，_情__绪__4．far-reachingadj.__影__响_深__远_的__5．immuneadj.___有_免__疫_力_的___6．celln.___细__胞___单词检验 7．incorporatevt.__将_…__…__并_入__...
The two main kinds of antigens, A and B, determine your blood type. 这两种主要的抗原A和B决定了你的血型。 But how do we get four blood types from only two antigens? 但仅从这两种抗原我们怎么得到四种血型的呢? Well, the antigens are coded for by three different alleles, varieties of a...
He has one major thesis, turning conventional wisdom on its head.Far from outside powers like Britain being civilised mediators, selflessly trying to pacify Balkan peoples who were just raring to cut each other's throats, it is the Great Powers who have been mainly to blame for the Balkan...
We do it a couple of times a day, but we should really understand why we do it!我们一天刷好几次牙，但是我们应该真正了解为什么要这样做！So: Why do we have to brush our teeth?所以：我们为什么必须刷牙呢？Well, have your teeth ever felt just. . . yucky?好吧，你的牙齿有没有感觉恶心过...
M: Are we having an exam tomorrow? W: Yeah, Our class will having a math exam tomorrow morning, Did you forget it? M:Oh, I don't think I 'll go to the concert, either. 5. What is the woman going to do tonight? A. Go to a concert. B. Phone her doctor. C. Prepare for ...