n.硬質(zhì)地層；粘土層；砂礫層

Prices have reached(the) hardpan. 物價(jià)已經(jīng)降到了最低點(diǎn)。

When small lakes dry up, they leave a salt crust or hardpan. 當(dāng)小的湖泊干枯時(shí)候，它們留下鹽殼或沙礫層。

Its uninviting surface is marked by mesas and buttes, and barren stretches of parched desert hardpan. 不起眼的表面有著臺(tái)地與小尖山以及貧脊乾燥的沙質(zhì)地基。

The various kinds of data-financial affair, human affairs and various files in work system are conserved in computer hardpan. 辦公系統(tǒng)中各種重要數(shù)據(jù)如財(cái)務(wù)帳目、人事資料、各種檔案等將保存在計(jì)算機(jī)的硬盤中。

The most important problems research had to solve were: (1). build-up and maintenance of soil fertility; (2). avoid soil hardpan and (3). control soil erosion. 研究要解決的最重要問題是：（1）積累和維持土壤肥力；（2）避免土壤硬磐；（3）控制土壤侵蝕。