Keep your feet under your desk; do not let them protrude into the aisle.

把脚放在书桌下面，不要伸到走道上。

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The recesses that extend to the horizontal leg protrude into peripheral grooves (14) of the spindles and secure the same against being unintentionally pulled off.

延伸到水平腿中的 缺口突进锭子的圆周槽（14）中并且防止锭子不经意地拉出。

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The pinlike electrodes, which protrude into the brain's gray matter, picked up signals from the neurons nearby.

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