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1·Let's have a look at the exposure meter.

我们来查一下曝光表。

2·And there's an exposure meter in a case attached.

另外还带有一个装曝光表的盒子。

3·Light meter: An electrical exposure meter for measuring light intensity.

测光表：用来测量光强度的一种电子曝光表。

4·You'd better consult the exposure meter if you be not sure of the time for exposure.

如果你嘱不准曝光时间，最好查一下曝光表。

5·You'd better consult the exposure meter if you're not sure of the time for exposure.

如果你吃不准曝光时间，最好查一下曝光表。

6·You'd better consult the exposure meter if you are not sure of the time for exposure.

如果你拿不准曝光时间，最好查一下曝光表。

7·You 'd better consult the exposure meter if you are not sure of the time for exposure.

如果你算不准曝光时间，最好查一下曝光表。

8·Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.

通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。

9·Chronic exposure to more than 65 micrograms per cubic meter of any type of particle in this size range may increase risk for health problems.

长期暴露在含有超过65微克每立方米的任何颗粒的空气中，都会增加健康隐患。

10·The EPA's threshold for safe exposure to PM 2.5 particles, as they're called, is 15 micrograms per cubic meter of air.

美国环保局的安全环境门槛是可吸入颗粒为PM 2.5，即每立方米空气中颗粒含量为15(译者：应该为25)微克。