黑板上用粉笔写着7个人名。There was a blackboard with seven names chalked on it.他在黑板上又写了几条注释。He wrote a few more notes on the board.他用一截粉笔将她的指示写在黑板上。With a stick of chalk he wrote her order on a blackboard....
Humming bird beats his wings almost 100 times per second.蜂鸟每秒钟拍动翅膀近100次.Bird's body size, there is also a small humming bird ostrich.鸟的体型大小不一, 既有很小的蜂鸟也有巨大的鸵鸟.This is a humming - bird moth.这是蜂鸟科的天蛾....