The prisoners must be kept in check.

囚犯们必须严加管束。

youdao

BERLIN - Germany's unemployment rate edged up to 8.3 percent in August, but was kept in check by employers' use of shorter work hours instead of layoffs.

柏林——德国的失业率8月份微幅上升，达8.3%，但是得到了控制，因为雇主利用削短工时而不是解雇员工来应对这个问题。

youdao

There's no known cure for hepatitis B, although the virus can be kept in check with anti-viral medicines.

VOA: standard.2010.07.26

He indicated that other contagious or infectious diseases were also kept in check.

VOA: standard.2009.11.29

Gold prices held in a slight range, kept in check by a lack of influencing factors.

FORBES: P.M. Kitco Metals Roundup: Weaker Technical Chart Picture Pressures Gold, Silver

Until recently, those pressures had been kept in check partly thanks to a strong dollar.

ECONOMIST: The yen

As their profits have recovered, the larger legacy carriers have kept in check their urges to increase capacity.

WSJ: The Weekend Interview with Bill Ayer: An Airline That Makes Money. Really.