现在,如果已经拿到澳洲留学offer的同学应该已经在做行前准备了。那女生去澳洲留学必不可少的物品就是防晒霜了,因为澳洲马上就要进入夏季,也是一年中紫外线最强的时候。下面留学群就来说说女生去澳洲留学如何选择防晒霜。
Sunscreen comes in many forms, each with its own impacts on your body
and the environment.
防晒霜有各种形式的,每一种对于你的身体和大环境都有着不同的影响.
With so many options, how do you choose which sunscreen
is best for you?
有这么多的选择,你应该如何选择最适合你的防晒霜呢?
To answer that question, we first have to understand how sunscreens work.
为了解答这个问题,我们首先需要知道防晒霜是如何起到它的作用的
Sunlight is composed of electromagnetic waves and is our primary source of ultraviolet radiation, which has a shorter wavelength than visible light and carries more energy.
太阳光是由电磁波组成的,也是我们接收到的紫外线的主要来源,它有相较可见光更短的波长,也带有更多的能量
UVA, UVB, and UVC are classified according
to their wavelengths.
a波紫外线、b波紫外线和c波紫外线是由它们的波长来区分的
Short wavelength UVC never reaches the Earth's surface, but UVB and UVA do.
短波长的c波紫外线到不了地球表面,但是a波和b波紫外线可以到达。
Medium wavelength UVB rays can enter the skin's superficial layers and long length UVA rays can penetrate into the deeper layers.
中等波长的b波紫外线了,可以进到皮肤的表层,而长波长的a波紫外线则可进入皮肤的深层。
UVB in small amounts actually helps us make vitamin D, which enables our bodies to build and maintain strong bones.
少量的b波紫外线可以帮助人体产生维他命D,它能让我们的身体保持强壮的骨骼
However, prolonged exposure to UVA and UVB can damage DNA, age your skin, and promote the development ...