虽然它们听起来很高效而且节约成本，但最近的一项研究表明，它们并不有效，主要是因为抑郁症患者与之接触的可能性低，也难以坚持下去。
While they sound efficient and cost-saving, a recent study reports that they are not effective, primarily because depressed patients are not likely to engage with them or stick with them.
这是一项重要的创新，因为骆驼能够在恶劣的沙漠条件下茁壮成长，并以低廉成本搬运大量货物，这使它成为一种有效且高效的运输工具。
This was an important innovation, because the camel's abilities to thrive in harsh desert conditions and to carry large loads cheaply made it an effective and efficient means of transportation.
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