In addition; moreover — a conjunction used to add another point or item.
今日は雨だ。加えて風も強いので出かけるのはやめよう。
It's raining today. In addition, the wind is strong, so let's not go out.
彼は日本語が堪能だ。加えて英語も流暢に話す。
He is proficient in Japanese. Moreover, he speaks English fluently.
予算不足に加えて、人手も足りない状況だ。
In addition to a budget shortfall, there is also a shortage of personnel.