Launch had been planned for early February, but it was delayed to repair a hydrogen leak and, more recently, to give engineers time to fix a helium pressurization problem in the rocket's upper stage. Launch is now on hold until at least April 1.
但要真正实现这一切，却并不容易。刘强东之前，已先后有多位企业家以不同方式入局其中，然而进展与成就却可以说是乏善可陈。
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In Pakistan too, gathering verified information from border areas independently is not easy.
Российские ученые разработали способ отслеживать загрязнение водоемов по активности белков в печени рыб. Об этом говорится в статье, опубликованной в журнале Veterinary Sciences.
“用发展的办法消除贫困根源”“一把钥匙开一把锁”