mainstay

n.

支柱，柱石；骨干，中流砥柱；主要的依靠；主桅支索

复数：mainstays

1. He is the mainstay of our theatre group.
   他是我们剧组的台柱。
2. Farming is still the mainstay of this country.
   农业仍是这个国家的主要依靠。

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