protecting freshness的用法和樣例：
例句
- I keep a wary eye on the freshness date and examine the tamper-proof packaging.
我會用機警的眼光查看商品的保鮮期以及包裝袋上的防偽標記。 - Payne has designed a new tear-tape system for opening hermetically sealed packs, which combines easy opening with airtight pack freshness.
佩恩設計了一個新的催淚開放磁帶系統的密封包裝，方便開放相結合的密封包裝保鮮。
