Extra police are being drafted in to control the crowds.

现正在另外抽调警察去控制人群。

《牛津词典》

Extra police is drafted in to control the crowds.

现正额外抽调警察去控制人群。

youdao

The Fifa secretary general, Jérôme Valcke, issued an apology over the problems as police were required to control the crowds in Johannesburg.

国际足联秘书长杰罗姆·瓦尔克（Jérôme Valcke）对出现这个问题进行了道歉，同时要求南非警察对约翰内斯堡的骚动人群进行控制。

youdao

Right now, as it stands, we're able to control the crowds.

NPR: Gulfport Takes Stock of Disaster

He has also rejected suggestions that government policy was to send troops into the Bogside, that troops were authorised to shoot troublemakers to control crowds and that any blame for casualties was intended to be placed on to the organisers and the gunmen.

BBC: Heath's barrister rejects allegations

Barbara Boxer, D-California, traveled a low road when she suggested that the state might not have enough National Guard troops to fight the fire, control crowds and prevent looting because of -- wait for it -- the war in Iraq.

CNN: Commentary: No time to take advantage of tragedy