Linguists can concentrate on all the aspects of language at once.
错误
语言是一种包含有多层次和多方面的综合体，语言学家们不可能一下子都能够研究得面面俱到，每一次只能集中研究其中的一个方面。改正：Linguistshavetoconcentrateononeaspectoflanguageatatimesincelanguageisacomplicatedentitywithmultiplelayersandfacets.22.InclassifyingtheEnglishconsonantsandvowels,thesamecriteriacanbeapplied.
When _ the contract, please include the arbitration clause.
Not until this morning _ your L/C.We can _ make shipment as stipulated in the contract.