Several thousand people marched on City Hall.

　　數(shù)千人涌往市政廳進行抗議。

　　The drug is not harmful per se, but is dangerous when taken with alcohol.

　　這種藥本身無害，但與酒同服就危險了。

　　The drug is to be reclassified after trials showed it to be more harmful than previously thought.

　　試驗顯示這種藥比先前想象的危害更大，要重新歸類。

　　You'll find it helpful to talk things over with a friend.

　　把情況和朋友詳細聊一聊，你會覺得大有幫助。

　　The people I spoke to were very helpful.

　　我交談過的人都很肯幫忙。

　　Can you find Black Hill on the map?

　　你能在地圖上找到布萊克山嗎？