每年的暑假,妈妈都要带我去爸爸的农场游玩。那里的鸟多,我最喜欢听布谷鸟的叫声;那里的昆虫更多,我最喜欢观察蚂蚁。一天下午,天阴沉沉的,好像马上就要下大雨似的。我赶紧往家跑,突然发现墙脚有一条“黑线”在缓缓 Every summer vacation, my mother will take me to my father's farm to play. There are many birds there, and I like to hear cuckoo calls most; there are more insects and I like to watch ants. One afternoon, the sky was gloomy, as if it was about to rain. I quickly ran home, suddenly found a wall “black line ” in the slow