Large, well-concealed RCTs of sufficient power are urgently needed.
迫切需要大型良好隐蔽，有足够强度的随机控制试验。
2
The rifles were well-concealed in the false-bottomed kitbags but for some reason the rifle was found and the customs man, running from the scene, sounded the alarm.
步木仓被很好地藏在行李箱的底部暗格中，但是不知为何地被发现了，海关官员迅速逃离现场并打开了警报。
3
Dug into a mountainside, the hockey arena is wellconcealed and energy-efficient.