The algorithm USES an adaptive filter to track the echo path, and an auxiliary filter to cancel the echo together with the adaptive filter.

该算法使用自适应滤波器跟踪回声信道，使用一个辅助滤波器和自适应滤波器一起完成回声消除。

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The excavation technique consists of main operations including breaking, loading, haulage and support, and auxiliary work including ventilation, laying the track, digging ditches and laying pipes etc.

掘进工艺包括主要作业和辅助作业，其中主要作业包括破岩、装岩、运输、支护，辅助作业包括通风、铺设轨道、挖掘排水沟、铺设管线等等。

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Extensive use of a large number of auxiliary equipment, gymnastics are from track and field, ball sports, and other salient features of a.

广泛大量地使用辅助器械，是体操区别于田径、球类等其它运动项目的一个显著特点。

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But on an auxiliary (and sometimes hidden) track employees can use a brokerage window to buy thousands of different mutual funds and usually exchange-traded funds and individual stocks, too.

FORBES: Jumping Out The 401(k) Brokerage Window