The formation mechanism of orange valvule-like pinhole in rolled aluminium foil was investigated by using optical microscopy,scanning electron microscopy,and energy dispersion X-ray spectrum.

利用光学显微、扫描电、能谱分析等试验手段对铝箔中"桔瓣"形针形成的原因进行了分析。

Pinhole. A short unwelded area in the weld line extending through the entire pipe so that fluid will leak out through the area very slowly.

针。缝线上位接的、贯穿管子整个壁厚的细，可导致流体该缓慢漏出。

Telocentric lenses work with a wide depth of field. With a telocentric lens, you can image objects of different distances from the lens and the objects stay in focus.

具端着丝粒的(注:我猜是类似于针)具有宽阔之景深，以具端着丝粒的，你能够将由不同距离之目标物成像和保持目标物在焦。