3 i at twele . i at half past eleven 我在十二点钟。我在十一点钟。
2.
At half past eleven we had to leave for home . how happy we were today 十一点半我们不得不离开科技馆回家了。今天我们可真愉快呀!
3.
At half past eleven 在11点半
4.
An astronomer can predict with absolute accuracy just where every star in the heavens will be at half past eleven tonight 天文学家能以绝对的精度预言每一颗星星于今晚十一时半的正确所以。