Modifier + 战
战 (zhàn) means "war," "battle," or "conflict" and can function as both a noun and a bound morpheme in compound words. It appears in terms like 关税战 (tariff war), 贸易战 (trade war), and 战争 (warfare). It conveys the idea of an organized, large-scale confrontation between opposing sides.
两国之间的贸易战越来越激烈了。
liǎng guó zhījiān de màoyìzhàn yuè lái yuè jīliè le.
The trade war between the two countries is getting more and more intense.
这场关税战对双方都没有好处。
zhè chǎng guānshuìzhàn duì shuāngfāng dōu méiyǒu hǎochù.
This tariff war is not beneficial to either side.
他在研究二战时期的历史资料。
tā zài yánjiū èrzhàn shíqī de lìshǐ zīliào.
He is researching historical materials from the World War II period.