In photography, to let too little light reach the film or the sensor, so the picture comes out too dark. The shutter closed too fast, or the room was darker than you thought, and the shadows turn into flat black with nothing in them. You can underexpose a photo, or a photo can be underexposed — both are normal.

In photography在攝影中, to let too little light reach the film or the sensor如果讓太少光線到達底片或感光元件，so the picture comes out too dark照片就會拍得太暗。The shutter closed too fast可能是快門關得太快，or the room was darker than you thought或是房間比你想的暗，and the shadows turn into flat black with nothing in them陰影就會變成一片死黑、什麼細節都沒有。You can underexpose a photo你可以說underexpose一張照片，or a photo can be underexposed或說一張照片被underexposed——both are normal兩種說法都可以。

The opposite is 'overexpose', where too much light makes everything pale and washed out. Photographers today sometimes underexpose on purpose: a digital sensor can often bring back detail from dark areas but never from a blown-out white sky, so 'expose for the highlights' means deliberately shooting a little dark.

The opposite is overexpose相反的是overexpose，where too much light makes everything pale and washed out就是太多光線讓畫面全都泛白、洗掉細節。Photographers today sometimes underexpose on purpose現在的攝影師有時候會故意underexpose：a digital sensor can often bring back detail from dark areas數位感光元件常常能把暗部的細節救回來，but never from a blown-out white sky但沒辦法救回過曝死白的天空，so expose for the highlights means deliberately shooting a little dark所以expose for the highlights的意思就是故意拍暗一點。

So the word is not automatically a criticism, though on its own it usually points at a mistake. Occasionally you meet it outside photography, meaning someone got too little exposure to something — an idea, a language — but that use is uncommon and 'have little exposure to' is what people normally say.

So the word is not automatically a criticism所以這個字本身不算是批評，though on its own it usually points at a mistake雖然單獨使用時通常是在指一個失誤。Occasionally you meet it outside photography偶爾你會在攝影之外遇到這個字，meaning someone got too little exposure to something意思是某人對某樣東西接觸得太少——an idea像是一個想法, a language或一種語言——but that use is uncommon但這種用法不常見，and have little exposure to is what people normally say一般人通常會說have little exposure to。