gōng / chéng / shī / zài / cè / shì / zhōng / yòng / hóng / sè / bǎ / biāo / biāo / chū / xū / yào / guān / chá / de / wèi / zhì

工程师在测试中用红色靶标标出需要观察的位置。

During the test, the engineer used a red target to mark the position that needed observation.