增援

yǐ yī gè tuán de bīng lì lái zēng yuán gāi shī

以一个团的兵力来增援该师

reinforce this division with a regiment's worth of troops

huǒ sù zēng yuán

火速增援

throw in immediate reinforcements

pài chū le zēng yuán bù duì

派出了增援部队

send in reinforcements

jǐng fāng qǐng qiú zēng yuán

警方请求增援。

The police called for reinforcements.