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mainstay メインマストを支える綱、頼みの綱、大黒柱、中堅、要（かなめ）

mainstay item 主力商品

Manufacturing has been the mainstay of Japan's economy since the 1960s and today accounts for just over 20% of current-price GDP.

dominate a market 市場を牛耳る、シェアの大半を占める

dominate　中心となる

The electronics and car industries continue to dominate Japan's manufacturing sector and have had huge success in penetrating international markets.

exhibit 示す、表す

Japan also exhibits a low degree of openness to foreign trade.

non-tradeable sector　非貿易部門

This lack of openness to foreign trade has often been cited as one of the reasons for the persistence of structural problems in the country's economy in general and the poor productivity of companies in the non-tradeable sectors in particular.

invoice

The euro area's total trade with the rest of the world is about as big as America's; about half of this trade is invoiced in euros.