Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
Somecosmeticsmanufacturersattempttocapturetherose'sunmistakablefragrance香味insoapsandperfumes.