back up ring

基本解釋

Ring up when you get back from your holidays.
你度假回來后請打個電話來。
When the O-ring has relaxed to grasp the shoulder protection, the bonnet assembly may be assembled into the body with the O-ring clinging to the back-up washer.
當放松O形環(huán)使其恢復(fù)原狀，此時O形環(huán)就抓緊肩部保護，帶著粘附著后部墊圈的O形環(huán)，閥帽組件可以組裝進閥體內(nèi)。
With the improvement of living and the strengthening of consumers self-realization, more and more self-symbol-product, such as CRBT(Color Ring Back Tone), well up in market.
生產(chǎn)力的提高、人們自我意識的加強，促使越來越多類似彩鈴的自我符號性商品涌向市場。

Sometime between the engagement and the Christmas holidays they broke up, but got back together again just in time to ring in the New Year.
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