I already explained that beavers are industrious , but even beavers can 't hold a candle to the mule .
我已经解释过:海狸是勤奋的,但却不能和骡子相提并论。
Specifically , a mule is the infertile offspring of a male donkey , or " jack " , with a mare .
尤其,公驴(或者叫公畜)的后代骡子和母驴是不能生育的。
In his mind 's eye he sees her body rocking forward and back as the mule traverses the rocky trail , her reddish-gray hair lit from behind by the desert sun .
在想象中,他看到当骡子穿过石头小路时她的身体前后摇晃,她略带红色的灰白头发被沙漠的太阳从后面照亮。
In an unflattering homage to muslim tradition , asimov even casts the mule as a mutant , a freak of nature so unexpected that nothing in human science could possibly have explained or anticipated him .
Roadbuilding became a far bigger business , whereas blacksmiths , farriers and buggy-whip makers faded away as america 's horse and mule population fell from 26m in 1915 to 3m in 1960 .
Splurge on fun things like riding a mule halfway down the grand canyon , have a nice meal in a national park lodge overlooking something beautiful , get a fishing license for the day to go fishing in a clear cold stream , an have an outdoor bbq -- plan ahead and schedule the good stuff .