2 You can get in or drop out the seminar at anytime within the two hours.
2 You can get in or drop out the seminar at anytime within the two hours.
2在规定的时间内，可随时加入或退出座谈。
2 You can get in or drop out the seminar at anytime within the two hours.
2在规定的时间内，可随时加入或退出座谈。