With only rudimentary instruments, the surveyors still mapped the coastline to within a few hundred meters.
仅凭简陋的仪器，测量员仍将海岸线测绘到误差数百米之内。
Which choice best defines “rudimentary”?
D — Basic; undeveloped.. “rudimentary” means Basic; undeveloped..
Which word means “Basic; undeveloped.”?
C — rudimentary. “rudimentary” means Basic; undeveloped..
rudimentary — Basic; undeveloped.. In Chinese: 基本的；初步的.
rudimentary is pronounced //ˌruːdɪˈmɛntri//.
With only rudimentary instruments, the surveyors still mapped the coastline to within a few hundred meters. (仅凭简陋的仪器，测量员仍将海岸线测绘到误差数百米之内。)
basic, elementary, undeveloped — all close in meaning to rudimentary (Basic; undeveloped.).
advanced, sophisticated — each the opposite of rudimentary (Basic; undeveloped.).
Yes. rudimentary is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
rudi(粗) → 粗浅初级。