cautiously and briefly
谨慎而简短
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He did not omit to avail himself of the opportunity, cautiously and briefly: too cautiously to betray his presence by the slightest noise.
他没有错过这个机会，谨慎而且迅速；谨慎得一点声音都没有，免得让人知道他来了。
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