Mantle layer
[醫] 套層
?? 詞語組成解析
mantle
['m?ntl]
n. 覆蓋物;幕;披風;斗篷;
vt.&vi. 覆蓋;
layer
['lei?]
n. 層，層次;膜;[植]壓條;放置者，計劃者;
vt. 把…分層堆放;借助壓條法;生根繁殖;將（頭發）剪成不同層次;
vi. 形成或分成層次;[植]通過壓條法而生根;
??? 情景例句
When was your last day off?
上次休假是在什么時候？
No. You should have taken the Yellow Line bus. You can get one at the next stop.
不是。你該乘黃線車才是。到下一站你可以搭上。
How long was that?
多長時間了？