take the contagion得传染病They have been reluctant to admit AIDS patients, in part because of unfounded fears of contagion...他们一直不愿接纳艾滋病患者，部分原因是无来由地害怕被接触传染。They have been reluctant to admit AIDS patients, in part because of ...
The fossils at Dinosaur Cove are embedded in hard sandstones.恐龙峡谷中的化石都嵌在坚硬的砂岩中。Oftentimes, these fossils are not made available to science at all.科学界常常压根接触不到这些化石。fossils over two million years old两百多万年的化石...