不得开启 meaning in English
the tenderer shall sign and keethe bid documents when receiving and may not open them
Examples
- The tenderer shall sign and keep the bid documents when receiving and may not open them
招标人收到投标文件后，应当签收保存，不得开启。 - This system is used for safety reasons when one valve must not be opened without a second valve first being closed
这种系统用于这样的安全需要，如果另一个阀门没有先关闭，则这个阀门不得开启。