尽管在欧盟中财力最为不济，加上近来又苦陷抗议声中，保加利亚这个盟友或许并非对希腊最为有利，但毕竟希腊也无其他选择可言。
The poorest country in the EU, which has recently been rack ed by protests, is probably not the most useful of friends. But the Greeks do not have many other offers.
同时给出光学声子对极化子自陷能影响随阱宽的变化关系。
The influences of optical phonon modes on polaron self-trapping energies as functions of well width are given respectively.
声子色散的加强使极化子自陷能变大，有效质量也随色散的强弱而改变。
It is found that the more the phonon dispersion, the larger are the self-trapped energy of the polaron, and the variance are the effective mass of polaron.
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