1·You really have to whack the ball.
你真得重击这个球。
—— 《柯林斯英汉双解大词典》
2·He began each trial by culturing a thick pea-green soup of algae — the scum of a pond out of whack — directly under the bank of noon-lights.
在每一次尝试开始的时候，他都会先培养出一份浓稠的豌豆绿色的海藻汤——重击产生的一池渣料。
3·One worker gives a misbehaving funnel a good whack: "you can never stop an operator using a sledgehammer, " a plant manager says.
这里我的理解是工人重击有故障的烟囱。所以工厂经理说：“没法阻止操作工用大锤”。对应前文说的工人质素提高了，其实有些做法还是改不过来。
1·He gave the ball a good whack.
他猛击了一下球。
—— 《牛津词典》
1·Calcium can maintain blood to show alkalescent whack, person of prevention and cure is immersed in acidity easy fatigue system.
钙可保持血液呈弱碱性的正常状态，防治人陷入酸性易疲劳体制。
1·You're acting out of whack.
你的做法让你失去了机会。