解析库 > 填空经典1290题
Substantial atmosphere around planetary bodies acts as (i)_____ incoming objects. Smaller objects, particularly those that are lower in density and more fragile, (ii)_____ in the upper reaches of the atmosphere, whereas more intact, larger bodies may survive to impact the surface. Thus, relative to large craters, small craters are much less (iii)_____ on bodies with dense atmosphere, such as Earth, Venus, and Titan, than they are on Mercury and Moon.
- effective obscurers of
- significant filters to
- impenetrable barriers against
significant filters to , vaporize , common 显示答案