A lack of
缺乏，缺少
🧩 词语组成解析
lack
[læk]
vt. 缺乏，缺少;需要的东西;
n. 缺乏，不足，没有;缺少的东西;
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
I don't know how she does it.
我不知道她怎么办到的。
Poverty on an old man's back is a heavy burden.
老而贫穷，负担沈重。
And then I watched all the glasses that were on the table fall off onto the floor.
接着我看到桌上所有的玻璃杯都掉到了地板上。