本期内容：

Vladimir Putin said Russia would start withdrawing the “main part” of its forces in Syria, saying their main objectives (officially, fighting terrorism; actually, keeping Bashar al-Assad in power) had been achieved. But Russia will keep its bases there and could quickly resume air strikes. The Russian president’s statement came as Staffan de Mistura, the UN’s peace envoy, started preliminary peace talks in Geneva.

词义解析:

Withdraw: 撤回
Objective：目标
Resume：重新开始
Envoy：特使
Preliminary：初步的