单语范例（未经PONS编辑处理）
They were intended as small convoy escort ships that could be produced quickly and cheaply in large numbers.
en.wikipedia.org They decided to build the railway as cheaply and simply as possible.
en.wikipedia.org Other impacted resources, such as oil reserves and the retention of the local watershed, can often be cheaply conserved by thoughtful designs.
en.wikipedia.org Especially important has been the use of enzymatic kinetic resolution to efficiently and cheaply prepare amino acids.
en.wikipedia.org Many new manufacturing techniques were perfected, enabling the city's factories to mass-produce their pens cheaply and efficiently.
en.wikipedia.org