Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
A、schemesThe megaphone(microphone) makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
Someseaurchins海膽havevenomous(toxin)spines
The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.
In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.
Somechildrendisplayanunquenchable難以抑制的curiosityabouteverynewthingtheyencounter.
