They leap to their feet, clench fists and let out long screams, clawing at the ground and air.
他们跳起来，握紧拳头，发出长长的尖叫声，抓向地面或空中。
2
If it is displayed on such occasions, do not allow the flag to fall to the ground, but let it be carried high up in the airto form a feature of the ceremony.
如果在这种场合展示国旗，不要让国旗掉到地上，而是让它高高地悬在空中以构成仪式的特色。
3
It removes heat from the air outside or the ground below and uses it to supply heat to a building or its water supply.