If no match is found, return null to the client application.

如果没有发现匹配，就向客户端应用程序返回空值。

youdao

If no match is found, the screensaver is locked, effectively locking an opportunistic attacker out of the system.

如果未找到匹配，则锁定屏幕保护程序，从而可以将那些碰运气的攻击者有效地锁定在系统外部。

youdao

If no match is found within the input, a null value is returned.

如果在输入中未找到匹配项，则返回空值。

youdao

Fifa's disciplinary committee studied footage of the post-match press conference and found no grounds to take any action.

BBC: World Cup 2010: Referees must be tougher - Elano

Politicians keen on a Yes vote found they could not talk up the treaty on their local radio stations unless a No campaigner were found to match them.

ECONOMIST: Ireland