We’ll have to do the whole thing again ______ scratch.

single choice： what's the meaning of this radical “ 耳 ěr ” ？

The report says that not eating well in older age affects mood and can influence appetite, which __ turn, affects nutrient intake.

The children exploded ______ giggles when seeing the clown.

He tried to use his own weight to push the attacker off but he was ______ balance.