The dynamic element can be driven to generate the aspiration movement as soon as the tape spool rotates, so the number of the dynamic elements can be increased.

由于带盘每旋转一次动力元件都会驱动一下产生抽吸动作，因而还可增加动力元件的数量。

youdao

A device, such as a cylinder, spool, or frame, that turns on an axis and is used for winding and storing rope, tape, film, or other flexible materials.

卷轴：一种如卷筒、卷轴或框，绕轴旋转装置，用于卷起和贮存绳索、磁带、胶片或其它带弹性的物质。

youdao

On dictation equipment, a spool on which magnetic tape is wound.

在口述记录设备上，一种卷绕磁带的轴。

youdao

The stored data "is sequential, like a magnetic tape, where you have to spool through stuff to get at the data, " said bioengineer Sriram Kosuri at the Wyss Institute for Biologically Inspired Engineering at Harvard, who was the project's lead researcher.

WSJ: Harvard Researchers Turn Book Into DNA Code