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piece v.拼成整体
piece n.(part)
a piece of cake /a piece of news
piece v.(put parts together to form a whole)
piece together 拼凑
-They piece the log book together.
piece up 修补，拼合
-Please piece up the dress.
sub-：
1)表示下：
submarine，subway地铁，substructure 下层建筑，subsoil下层土，subnormal低于正常的
2）表示次、准、亚：
subtropical亚热带，sub continent次大陆
3）表示副、分支、下级、下属：
subeditor副编辑，subagent
subhead副标题，sub office分办事处
The salvage operation had been a complete failure. The small ship, Elkor, which had been searching the Barents Sea for weeks, was on its way home.
A radio message from the mainland had been received by the ship's captain instructing him to give up the search.
