Between 400 and 600 grams, it has no further effect, but when it exceeds 600 grams, it ACTS as a shield against the sun, and slows down melting.

每平方米在400克至600克之间时，不再有进一步的影响；但是当每平方米超过600克时，覆层就起到遮挡阳光的作用，从而减缓融化的速度。

youdao

The James Webb Space Telescope (JWST) will be a giant-its multilayered sun shield stretches 22 meters, nearly twice the length of the Hubble Space Telescope.

詹姆斯·韦伯太空望远镜(JWST)体态硕大无比- - -其多层遮阳板的长度将达22米，几乎是哈勃太空望远镜的两倍。

youdao

By looping around L2, JWST can keep its shield pointed at the sun while avoiding the shadow of Earth and the moon.

由于詹姆斯·韦伯太空望远镜在围绕L2运行，因此可以使其遮阳板对着太阳，同时又避开了来自地球和月球的阴影。

youdao

The Sun's magnetic field and solar wind - mainly in the form of electrons and protons coming out of the Sun - protects the entire Solar System by acting as a sort of shield from cosmic rays (very energetic particles and radiation from outer space).

BBC: Viewpoint: The Sun and climate change