alternate between joy and grief的用法和樣例：
例句
- The sudden relief from strain left her in a tremulous state between laughter and tears.
由于從緊張狀態(tài)中獲得解脫太突然，所以她又處于一處悲喜交加的不安狀態(tài)。 - The result is a bittersweet baby boom, the joy of each birth tempered by the rawness of the recent loss.
結果就是悲喜交加的生育高峰，新生命誕生的喜悅釋緩了剛剛失去孩子的傷痛。
