strata

英 ['strɑːtə] 美['strætɚ]

TOEFL

strata: strata: [16] Latin strātum meant ‘something laid down’. It was a noun use of the neuter past participle of sternere ‘spread out, lay down, stretch out’, which also produced English consternation [17] and prostrate [14]. Its use for the abstract concept of a ‘layer’ (in English more usually in the plural strata) is a modern Latin development. Other English words from the same source include stratify [17], stratosphere [20] (the ‘layer’ of the atmosphere above the troposphere), stratus [19] (cloud in thin ‘layer’- like form), and street.
=> consternation, prostrate, straw, street
strata (n.): c. 1700, plural of stratum.

1. The rebels came overwhelmingly from the poorest strata of rural society.: 叛乱分子绝大多数来自农村的最贫困阶层。

4. Mostly applying the STRATA velocity inversion section predicts the distributed field of reefs depth.: 并主要运用STRATA速度反演剖面来预测生物礁厚度变化的分布范围,勾绘出生物礁储层的厚度变化分布图.

5. Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.: 岩层中有证据表明，该地区在15,000年前曾经非常干旱。