to guard against

• 作好防备

  take precautions

• 防备措施

  precautionary measure

• 防备水灾的办法

  methods of flood prevention

• 防备间谍的破坏

  guard against damage caused by espionage

• 防备敌人突然袭击

  guard against a surprise attack by the enemy

• 要有个防备才好。

  It would be better to take precautions.

• 要防备万一出什么事。

  Precautions should be taken to guard against the unexpected.

• 路上很滑，走路要小心，防备跌倒。

  The road is slippery, so take care not to slip and fall.