v.
engage by written agreement
同义词：signcontractsign onsign up
join a club, an activity, etc. with the intention to join or participate,
同义词：sign up
Conservation reserve program: Enrollment statistics for signup periods 1-12 and fiscal years 1986-1993. Statistical bulletin (Final)
Adopting sustainable innovation: what makes consumers sign up to green electricity?
Conservation Reserve Program: Enrollment Statistics for 1987-88 and Signup Periods 1-7
The Conservation Reserve Program: enrollment statistics for signup periods 1-11 and fiscal years 1990-92
Platform for defining single-page web signup facilities
OPT-IN E-MAIL PUTS A NEW FACE ON PUSH Web users invited to sign up for targeted delivery of news (and maybe an ad).
Subject Pool Sign-Up Procedures: A Threat to External Validity.
Umicore signs up to funds its own site recoveries
Sharing cultural heritage the linked open data way: why you should sign up
Self-directed, integrated clinical learning through a sign-up system
