straight-through的用法和樣例：
例句
- Visitors can observe the guard screen of the infrared laser through the night vision snooper scope.
它的頂部是一個(gè)球型的高壓電極，在下部底箱內有一直流高壓電源。 - When it is in the vertical welding position, the slag and melted iron can not be dripped and the through welding of weld sublayer can be ensured.
并對直流電源型的焊條藥皮堿性渣系的選擇，獲得較好的低溫沖擊韌性。
