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| footing; subjacency; substory | |||
| bottom slice; low story; under level; understorey | |||
| substrata | |||
| substratum; bottom course | |||
| underlying seam | |||
| child level | |||
| under stratum | |||
| lower layer; sublayer; understratum; subterrane | |||
| underlayer | |||
| bottom bed; bottom layer; lower bed; lower coat (面层); lower course | |||
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| sublayer | |||
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| substratum | |||
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| sublayer | |||
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| understratum | |||
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| subnatant | |||
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| underseam | |||
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| lower coat | |||
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| substratum | |||
| 下 层: 840 phrases in 57 subjects |