1.Opponents of this use of antibiotic say it adds to worldwide resistance to such drugs.
add to 加入,加到;增添,添加(某物);加强:
Add the second total to the third.
把第二笔总额加在第三笔总额上 。
The bad weather added to the shipwrecked sailors’ difficulties.
恶劣的天气增加了失事船只的船员们的困难
。