根据所给首字母及英文释义写出下列单词
b(n)thedistancealongacitystreetfromonestreettothenext
s(adv)inalineordirectionthatisnotcurvedorbent
l(N)apowerfulflashoflightintheskycausedbyelectricityandusuallyfollowedbythunder
a(N)thewaysomeonepronouncesthewordsofalanguage,showingwhichcountryorwhichpartofacountryhecomesfrom
L(n)alargevehcleforcarryingheavygoods