Certificate of security
[经] 保证单
🧩 词语组成解析
certificate
[sɚ'tɪfɪkət]
n. 证明书;文凭，结业证书;
vt. 发给证明书;用证书证明（或认可）;
cert 搞清 + ifi=fy表动词 + cate表名词 → certify搞清楚=证明+ cate表名词 → 证件
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
He was ill at ease with people whom he didn't understand.
他和不熟悉的人在一起感到不自在。
Someone is working in the manhole.
有人在
so that there are heavy odds in favour of our dying between the ages of sixty-five and eighty.
我们最可能死亡的年龄在65至80岁之间，