// document_start means these listeners are in place before any element exists
Optional. Recommended even if signing anonymously for verification purposes.
，更多细节参见同城约会
// Oops — forgot to call reader.releaseLock()
On a future mission, a heat shield named Pridwen after the legendary shield of King Arthur will be deployed to protect the spacecraft from the intense temperatures it will experience as it re-enters the Earth's atmosphere.