иxI(y)~Rôk
иxԇ_Ҫϵ~Rܵõ^ߵķ?jn)?sh)ʲô?

һиxһN}Ŀ~R}~R}@ӵһN}J(rn)R@~Ϳ϶ܺܿ㲻J(rn)R@~ǽ(jng)^ӌƔM˺ܶrg߀õe`ĽY(ji)fQ~R}J(rn)R@~
ô~R}иxԇожҪ?ռ25%ϵıġOGfÿƪx}3-6~}(ÿƪиxֻ13}ѽ)Ҋ~R}Ҫ--ֻҪ~R}QpиxеһK?jn)?sh)߀}(ji)ʡˌFĕrg
иx~R}п~Rʲôy?6~RҲyһЩġԞ˱UҊ~ˮƽҪ_(d)6@ӾͿxІ~}ķ?jn)?sh)ÝM
P(gun)иxٶȵĆ}ЇиxһϵKڕrgãxµ`ٶ̫fJ(rn)R~ܿxf~̫СxٶȱȻۿ!
ڶиxҪ֪һcI(y)~R@^Ǻy܌~Rһиx~RƫڌI(y)|(zh)ģԭ@ӣ
иxԇǞ˿ӢZˮƽܷCڴW(xu)W(xu)(x)I(y)֪R˿ă(ni)ƫ،W(xu)g(sh)ķxҲĴW(xu)nĺ׃(ni)xȡڱ~ĕr?q)ڌW(xu)g(sh)~Roһ̶ȵҕǺ
иxČI(y)~Ry@cҲǺȻиһTӢZˮƽԇֲnjI(y)ԇy^ČI(y)~Rxд_F(xin)ǿă(ni)˼Ժز³eӣIt should be obvious that cetaceans--whales, porpoises, and dolphins--are mammals@OGx}еһԭ
@Ԓеcetaceanһ^I(y)o豳Ć~ֻҪJ(rn)R whalesdolphinsmammals֪cetaceanˮ()Dz@ஔ(dng)֪ cetacean˼Ҫӛmammalwhaledolphin@N^õČI(y)~Rcetacean@NƧѾڱ@NDĆ~Ǻֵܲõġ
иxI(y)~RôkP(gun)£
̘I(y)и xI(y)~R09-04
иx~R09-06
иx~R09-02
иx~Rx08-31
иx~R08-28
x~ôk09-27
̘I(y)и xֲW(xu)I(y)~R09-07
W(xu)̘I(y)и xI(y)~R09-04
иx~Rӛ08-08