He bought third-party liability insurance for his beloved car.
Tips
usage
Two distinct uses. (1) Cohesive device after listing three things: 'A、B、C,三者…' = 'A, B, C — these three…'. (2) In car insurance jargon 三者 is short for 第三者 (dìsānzhě, third party); 三者险 (sānzhě xiǎn) = third-party liability insurance.