| 释义 |
se.cure.lyHsI5kjJE7li, $-5kjJr-adv安全无虞地There are 15 000 kilometres of railway track, and it is impossible to guard it securely against terrorist attacks.对于15 000公里的铁路线，要万无一失地保护它不受到恐怖分子的袭击是不可能的。This certificate is an important document, and should be kept securely (= in a place where it cannot be lost or stolen).这张证书是很重要的文件，应该妥善安全保存。
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