英文:The lowest sill, block, or timber supporting a building, located at or below ground level.
中文:底基用来支撑建筑物的最低的基木、砌块或木料,位于地面或低于地面的
英文:The conditioned response, once it is firmly established, can be extinguished dozens of times, but it sill always return, like the proverbial bad penny.
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