liǎng àn
bilateral
both shores
both sides
both coasts
Taiwan and mainland
liǎng àn sān dì
China, Taiwan, Hong Kong and Macau (media term used esp. since 1997)
hǎi xiá liǎng àn guān xi xié huì
PRC Association for Relations Across the Taiwan Straits (ARATS)
Hǎi xiá Liǎng àn Guān xi Xié huì
PRC Association for Relations Across the Taiwan Straits (ARATS)