| 单词 | parts per |
| 释义 | > as lemmasparts per —— d. parts per —— (expressing a proportion).Cf. ppb n. at P n. Initialisms, ppm n. at Initialisms. ΚΠ 1843 Philos. Trans. (Royal Soc.) 133 332 Vegetation..is always acting to restore the atmospheric air to its original composition of twenty-one parts per cent. of oxygen. 1865 Philos. Trans. (Royal Soc.) 155 426 The sulphuric acid, lime, magnesia, and potash are given..in parts per 1000 sea-water. 1881 Proc. Royal Soc. 32 495 (table) Parts per million. 1902 E. A. Schäfer Essent. Histol. (ed. 6) 397 Zenker's fluid (which is Müller's fluid containing 5 parts per cent. of mercuric chloride). 1946 A. Nelson Princ. Agric. Bot. xiv. 329 Certain soils..contain about 20 to 100 parts per million of this element. 1959 T. R. E. Southwood & D. Leston Land & Water Bugs Brit. Isles xiv. 395 Waters with from 5 to about 18 parts per thousand of salt in solution. 1993 N.Y. Times 24 Mar. a16/2 Reducing dioxin levels to the Federal standard—less than 13 parts per quintillion in drinking water. < as lemmas |
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