It was about 30 seconds It took about 30 sec for Alex to come out the water.
Alex 花大约 30 秒从水中出来。
动词过去式
例如：
it was about 1 hour before the table was ready
it was about 1 hour before we went on
动词过去式
例如：
it was about 1 hour before the table was ready
it was about 1 hour before we went on
