They face competition from e-commerce retailers who undercut their pricing power and erode their margins.

同时还要面对不断侵蚀他们利润空间的那些削价电子零售商。

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Postal services are being liberalised around the world as new services such as e-mail, fax and data transfer have begun to erode traditional markets.

ECONOMIST: Post Office: Pass the parcel | The

Furthermore, we expect the gross margins to erode further as the effect of patent expiration takes place from the first quarter of the fiscal 2013 (i.e. from October 2012).

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