介绍采用双光子激发荧光方法进行单分子探测的原理和自行研制的实验装置，激发光聚焦和荧光收集采用共焦方式。
We report here briefly the principle and the device of our single-molecule detection spectrometer based on two-photon excited fluorescence.
与其他聚焦方式相比，多元组合聚焦超声换能器具有较大的聚焦深度、较理想的焦域以及较高的声强度等优点，并且聚焦区域和声强度易于控制。
Comparing with other kinds of focusing methods, it has a lot of merits: a deeper focal length, a greater ultrasound intensity and an ideal focal region and all of them are easily controlled.
焦博士估计，以这种方式储存在海洋中且以二氧化碳的形式所存在的碳含量足以和大气中所含的碳含量所匹敌。
Dr Jiao estimates that the amount of carbon stored by the oceans in this way is equal to the amount in the atmosphere, in the form of carbon dioxide.
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