每个人都应该有一套背奏曲目和一套视奏曲目。
Everyone should have a memorized repertoire and a sight reading repertoire.
1817年第一套建筑设计方案完成，沙皇亚历山大一世背签批准。
The first finished architectural project, was endorsed by Alexander I in 1817.
举重床的背垫采用滑杆滑套螺钉固定调节，调节范围增加，且方便灵活，操作简便；
Lifting weights of the bed by HuaGan slide set back cushion adjustment screws, adjusting range increased, and convenient and flexible, simple operation;
一种轻便型防雨鞋套，由鞋套前背、鞋套底、鞋套后背、鞋套口和鞋套侧背连成一体，在鞋套底的前部和后部分别设置防滑件和鞋套后根口。
The light waterproof overshoe consists of an integral vamp including front part, back part and side parts and a sole with anti-skid part and heel part separately in the front and back parts.
一种轻便型防雨鞋套，由鞋套前背、鞋套底、鞋套后背、鞋套口和鞋套侧背连成一体，在鞋套底的前部和后部分别设置防滑件和鞋套后根口。
The light waterproof overshoe consists of an integral vamp including front part, back part and side parts and a sole with anti-skid part and heel part separately in the front and back parts.
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