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The main way in which vaccinations prevent infection is by causing white blood cells to produce antibodies. These antibodies are produced rapidly upon re-infection and...

只要自己想做又能够做的就是休闲。

(This is a question from A level Chinese Test Paper 2 - Reading and Writing)

Definition: diffusion is the spreading out of particles from an area of high concentration to an area of low concentration

The theory:

Solve the equation :  x² - 8x + 15

The first step is to factorise the quadratic equation.

1. You must find two numbers which will add to g...