Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.

Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.

With the acquisition of smaller companies by larger ones, the 1960's saw a wave of new conglomerates.

Someseaurchins海胆havevenomous(toxin)spines

Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生动物flagellates鞭毛虫,flatworms扁形虫,andsegmentedworms片段蠕虫.